Rinse and slice squash and set aside.
Heat 2 tablespoons of butter in a skillet over medium high heat.
Roughly chop a medium yellow onion and mince 2 cloves of garlic.
Add squash, onion and garlic to heated skillet. Sauté until squash and onion are tender, about 8-10 minutes. Remove from heat.
Transfer squash mixture to a large bowl. Add cheeses, heavy cream and sour cream. Season with salt, black pepper, garlic powder, onion powder, paprika and red pepper. Stir to incorporate all ingredients.
Transfer squash mixture to greased baking dish and top with crushed Ritz Crackers. Add some fresh cracked black pepper right on top and a few pats of butter.
Bake in preheated oven for 40-45 minutes until golden and bubbly.