Easy Upside-Down Pizza Casserole

Ingredients (6)

• + 1 ½ pounds lean ground beef add to pantry
• ✓ 1 (15 ounce) can pizza sauce
• + 1 (4 ounce) can sliced mushrooms, drained add to pantry
• + ¼ cup sliced pitted ripe olives add to pantry
• + 1 cup shredded mozzarella cheese, or more to taste add to pantry
• + 1 (10 ounce) can refrigerated biscuit dough add to pantry