"This recipe for Slow Cooker John Wayne Casserole is a cowboy casserole recipe that can't be missed! This delicious and easy slow cooker ground beef recipe is meaty, cheesy, and packed with flavor. Sour cream and mayo make this casserole creamy, while ground beef, taco seasoning, and Cheddar cheese give this dish its savory flavor. Refrigerator biscuits hold the whole casserole together, and make it super satisfying! Even those with cowboy-sized appetites will be begging for seconds!..."