Sausage and Rice Brunch Casserole

Ingredients

• 1 pound pork sausage
• 3 cups hot cooked rice
• 2 cups shredded sharp cheddar, divided
• 1 can cream of mushroom soup
• 1 4 ounces can sliced mushrooms, drained
• 1/2 cup milk
• 3 eggs, lightly beaten
• 2 teaspoons creole mustard
• 1/4 teaspoon onion powder