Tex-Mex Keto Squash Casserole
Cheesy, creamy, and low carb, the Tex-Mex Keto Squash Casserole is a delightful dish that elevates your meal. Perfect for family dinners, potlucks, or holiday gatherings, this casserole combines the savory flavors of summer squash with the richness of cheese and spices. Whether you’re following a keto diet or just looking for a tasty side dish, this recipe will impress everyone at the table with its unique twist on traditional flavors.
Why You’ll Love This Recipe
- Easy to Prepare: With just a few simple steps, you can whip up this delicious casserole in no time.
- Flavor Packed: The combination of cheddar cheese, sour cream, and rotel tomatoes creates a rich and satisfying taste.
- Keto-Friendly: Low in carbs but high in flavor, making it perfect for those on a ketogenic diet.
- Versatile Side Dish: Pairs beautifully with grilled meats or can be served as a vegetarian main course.
- Family Favorite: Kids and adults alike will love the cheesy goodness!

Tools and Preparation
To prepare your Tex-Mex Keto Squash Casserole, gather your tools and get ready for some cooking fun!
Essential Tools and Equipment
- Large skillet
- Medium-sized casserole dish
- Mixing bowl
- Knife
- Cutting board
Importance of Each Tool
- Large skillet: Essential for sautéing the squash and onions to perfection.
- Medium-sized casserole dish: Ideal for baking the casserole evenly while keeping it moist.
- Mixing bowl: Helps combine all ingredients thoroughly before baking.
Ingredients
Cheesy, creamy and low carb squash casserole makes the perfect side dish.
For the Casserole
- 1 tsp olive oil
- 2 pounds summer squash, sliced
- 1 cup diced onion
- 1 can rotel tomatoes, drained (may use mild if desired)
- 1 ½ cups cheddar cheese, grated (reserve 1/2 cup for topping)
- ½ cup sour cream
- ½ cup mayonnaise
- ¼ tsp salt
- ¼ tsp black pepper
How to Make Tex-Mex Keto Squash Casserole
Step 1: Preheat the Oven
Preheat your oven to 350 degrees Fahrenheit. This ensures that your casserole bakes evenly.
Step 2: Cook the Squash and Onions
In a large skillet:
1. Heat the olive oil over medium heat.
2. Add the sliced summer squash and diced onion.
3. Cook while stirring occasionally until tender—this should take about 8-10 minutes.
4. Drain any excess liquid from the cooked squash mixture.
Step 3: Mix Ingredients
In a large mixing bowl:
1. Combine the drained squash and onion mixture with all remaining ingredients except for the reserved cheese.
2. Adjust salt and pepper to taste.
Step 4: Transfer to Casserole Dish
Pour the mixture into a medium-sized casserole dish. Sprinkle the reserved cheddar cheese on top for that melty finish.
Step 5: Bake
Bake in the preheated oven until bubbly and golden brown—this will take about 20-30 minutes. Allow it to set for 5-10 minutes before serving to let it firm up nicely. Enjoy your delicious Tex-Mex Keto Squash Casserole!
How to Serve Tex-Mex Keto Squash Casserole
Tex-Mex Keto Squash Casserole is a delightful dish that can be enjoyed in various ways. Whether you are serving it at a family dinner or a casual gathering, here are some fantastic serving suggestions to enhance your meal.
Pair with Grilled Chicken
- Grilled chicken breasts seasoned with spices complement the creamy texture of the casserole perfectly.
Serve with a Fresh Salad
- A vibrant salad with mixed greens, cherry tomatoes, and avocados adds freshness and balances the richness of the casserole.
Top with Fresh Cilantro
- Sprinkle chopped cilantro on top before serving for an extra burst of flavor and color.
Accompany with Guacamole
- A side of guacamole provides a creamy contrast that pairs well with the flavors in this dish.
Add a Dollop of Sour Cream
- Serving with extra sour cream on the side can enhance the creaminess and provide a cooling effect.
How to Perfect Tex-Mex Keto Squash Casserole
To ensure your Tex-Mex Keto Squash Casserole turns out perfectly every time, follow these helpful tips.
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Choose fresh squash: Fresh summer squash will provide the best flavor and texture. Look for squash that is firm and free from blemishes.
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Drain excess liquid: After cooking the squash, make sure to drain any excess liquid. This prevents your casserole from becoming watery.
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Mix thoroughly: Ensure all ingredients are well combined for an even distribution of flavors throughout the casserole.
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Experiment with spices: Feel free to add additional spices like cumin or chili powder for an extra kick that complements the Tex-Mex theme.
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Let it rest: Allowing the casserole to set for 5-10 minutes after baking helps it firm up, making it easier to serve.
Best Side Dishes for Tex-Mex Keto Squash Casserole
When planning your meal, consider pairing your Tex-Mex Keto Squash Casserole with these delicious side dishes for a well-rounded dining experience.
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Mexican Cauliflower Rice – A low-carb alternative to traditional rice made with riced cauliflower, spiced up with lime and cilantro.
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Zucchini Noodles – Lightly sautéed zucchini noodles tossed in olive oil make a refreshing and low-carb side dish.
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Black Bean Salad – A colorful mix of black beans, corn, peppers, and onions dressed in lime juice offers a hearty yet healthy complement.
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Avocado Tomato Salad – Creamy avocado paired with ripe tomatoes drizzled in olive oil adds a fresh touch beside your casserole.
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Roasted Bell Peppers – Sweet roasted bell peppers seasoned simply enhance the overall flavor profile of your meal.
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Spicy Shrimp Tacos – If you’re craving protein, add spicy shrimp tacos served on lettuce wraps for a satisfying crunch.
Common Mistakes to Avoid
When making your Tex-Mex Keto Squash Casserole, it’s easy to overlook some details. Here are common mistakes to avoid for the best results.
- Skipping the draining step: If you don’t drain the squash properly, your casserole may become watery. Always ensure excess liquid is removed after cooking.
- Not measuring ingredients: Eyeballing ingredients can lead to an imbalanced dish. Use measuring cups and spoons for more precise results.
- Overbaking the casserole: Leaving it in the oven too long can make it dry. Keep an eye on it and take it out as soon as the cheese is bubbly and golden.
- Using low-quality cheese: Cheaper cheeses may not melt well or have great flavor. Opt for good-quality cheddar for a richer taste.
- Ignoring seasoning adjustments: Different brands of ingredients can vary in flavor. Always taste and adjust salt and pepper before baking for optimal taste.

Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container for up to 4 days.
- Allow the casserole to cool completely before refrigerating.
Freezing Tex-Mex Keto Squash Casserole
- Freeze in a tightly sealed container or freezer bag for up to 2 months.
- For best results, consider portioning before freezing.
Reheating Tex-Mex Keto Squash Casserole
- Oven: Preheat to 350°F and bake covered with foil for about 15-20 minutes.
- Microwave: Heat on medium power, checking every minute until warm throughout.
- Stovetop: Warm gently over low heat, stirring occasionally until heated through.
Frequently Asked Questions
What makes this Tex-Mex Keto Squash Casserole low carb?
This casserole uses summer squash instead of traditional pasta or rice, significantly reducing carbs while still providing a satisfying texture.
Can I customize my Tex-Mex Keto Squash Casserole?
Absolutely! Feel free to add cooked ground beef, chicken, or extra vegetables like bell peppers for added flavor and nutrition.
How do I ensure my Tex-Mex Keto Squash Casserole is creamy?
Using both sour cream and mayonnaise ensures a rich, creamy texture that binds all the ingredients together beautifully.
What can I serve with my Tex-Mex Keto Squash Casserole?
This dish pairs wonderfully with grilled meats or a fresh salad, making it a versatile side or main dish option.
Final Thoughts
The Tex-Mex Keto Squash Casserole is not only delicious but also adaptable for various tastes. Whether you enjoy it as a side dish or a hearty main meal, this recipe offers comfort and satisfaction. Don’t hesitate to customize it with your favorite ingredients to make it your own!
Tex-Mex Keto Squash Casserole
Indulge in the creamy, cheesy delight of Tex-Mex Keto Squash Casserole, a low-carb dish that elevates any meal. This flavorful casserole combines fresh summer squash with sharp cheddar cheese, zesty Rotel tomatoes, and a hint of sour cream for a rich texture that everyone will love. It’s perfect for family dinners, potlucks, or holiday gatherings, appealing to both keto dieters and those simply seeking a delicious side. With minimal prep and cooking time, this dish is easy to make and even easier to enjoy.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Total Time: 45 minutes
- Yield: Approximately 6 servings 1x
- Category: Side Dish
- Method: Baking
- Cuisine: Tex-Mex
Ingredients
- 2 pounds summer squash, sliced
- 1 cup diced onion
- 1 can Rotel tomatoes (drained)
- 1 ½ cups grated cheddar cheese (reserve ½ cup for topping)
- ½ cup sour cream
- ½ cup mayonnaise
- 1 tsp olive oil
- ¼ tsp salt
- ¼ tsp black pepper
Instructions
- Preheat the oven to 350°F.
- In a large skillet, heat olive oil over medium heat. Sauté sliced squash and diced onion until tender (8-10 minutes). Drain excess liquid.
- In a mixing bowl, combine the drained squash mixture with Rotel tomatoes, cheddar cheese (except reserved), sour cream, mayonnaise, salt, and pepper.
- Transfer mixture to a casserole dish; top with reserved cheese.
- Bake for 20-30 minutes until bubbly and golden brown. Let rest for 5-10 minutes before serving.
Nutrition
- Serving Size: 1 cup (240g)
- Calories: 280
- Sugar: 4g
- Sodium: 480mg
- Fat: 22g
- Saturated Fat: 9g
- Unsaturated Fat: 11g
- Trans Fat: 0g
- Carbohydrates: 10g
- Fiber: 3g
- Protein: 9g
- Cholesterol: 40mg