This creamy and comforting beef and mushroom rice bake is a perfect one-pot meal that combines savory ground beef, earthy mushrooms, and cheesy goodness. The rich cream of mushroom soup and sour cream make the casserole irresistibly creamy, while the melted cheddar cheese on top adds a deliciously gooey finish. It’s an easy, filling dish that’s perfect for family dinners or potlucks.