Broccoli Casserole

Ingredients

• 2 (10 ounce) packages frozen chopped broccoli
• 2 (10.75 ounce) cans condensed cream of mushroom soup
• 2 cups instant rice
• 3/4 cup chopped onion
• 1/4 cup butter
• 1 (16 ounce) jar process cheese sauce
• salt to taste
• ground black pepper to taste