Preheat the oven to 350 degrees.
Prepare a 9X13 baking dish by spraying the bottom and sides with non-stick spray.
Boil the broccoli florets in salted water for 3 minutes, drain them, and put them into a large mixing bowl.
Season the broccoli with salt, pepper, and onion powder.
Cut the Velveeta Cheese into 1 inch cubes.
Stir the Velveeta Cheese into the broccoli until fully incorporated and all the cheese is melted.
Pour the broccoli cheese mixture into the casserole dish and distribute evenly.
Sprinkle the shredded cheddar evenly on top of the broccoli.
Mix the crushed ritz crackers with the melted butter then sprinkle on the top of the casserole.
Bake for 25-30 minutes until the cheeses are bubbly.