Follow these steps to create your amazing Southern Squash Casserole:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C).
2. Sauté Vegetables: In a large skillet, heat a splash of olive oil over medium heat. Add the chopped onion and bell pepper, cooking until soft, about 5 minutes. Add sliced squash and cook for an additional 5–7 minutes, stirring frequently until just tender. Remove from heat and let cool slightly.
3. Combine Ingredients: In a separate large bowl, whisk together the eggs, sour cream, melted butter, salt, black pepper, and garlic powder.
4. Add Vegetables: Stir in the sautéed squash, onion, and bell pepper to the egg mixture until well combined.
5. Mix in Cheese and Crackers: Gently fold in the shredded cheddar cheese and half of the crushed saltine crackers to the mixture.
6. Transfer to Baking Dish: Pour the combined ingredients into a greased casserole dish, spreading evenly.
7. Top It Off: Sprinkle the remaining crushed saltine crackers evenly on top for a crunchy topping.
8. Bake: Place the dish in the preheated oven and bake for 30–45 minutes or until the center is set and the top is golden brown.
9. Cool: Remove from the oven and allow it to sit for 10–15 minutes before serving to let it firm up.

This straightforward recipe ensures your Southern Squash Casserole will turn out perfect every time!