Louisiana Shrimp Casserole

INGREDIENTS

• 1 1/2 cups uncooked instant rice
• 1 1/2 cups water
• 1 teaspoon vegetable oil
• 1 pound small shrimp, peeled and deveined
• 2 tablespoons butter
• 1 (4 ounce) can sliced mushrooms, drained
• 1 (10.75 ounce) can condensed cream of shrimp soup
• 1 (8 ounce) container sour cream
• 3/4 cup shredded Cheddar cheese