Set a large skillet over medium heat and add one tablespoon of butter. Once melted add the squash, onion, and bell pepper. Stir to combine and cook, stirring often, until the vegetables are tender and soft- about 8 minutes. Season with salt & pepper, to taste.
3 tbsp butter, 2 lbs yellow squash, 1 small yellow onion, 1 red bell pepper, salt & pepper
To a small mixing bowl add the eggs, cheese, sour cream, and mayonnaise stirring together until evenly combined. Pour this over the vegetables, and stir together until evenly incorporated.
2 large eggs, 1 heaping cup shredded cheddar cheese, 1/4 cup sour cream, 1/4 cup mayonnaise
Add the remaining tablespoons of butter to a small microwave safe bowl. Heating just until melted. Add the crushed crackers, and whisk together until evenly combined. Set aside.
3/4 - 1 cup lightly crushed ritz crackers
Spray an 8x8" casserole dish with nonstick cooking spray, then spread the squash mixture out in the dish in an even layer. Spread the cracker crumbs evenly out overtop of the casserole.
Bake at 350° for 30 minutes, just until hot & bubbly and the crackers are golden brown.
Serve warm & enjoy!