I have seen the term "cowboy beans" refer to pork and beans (baked beans & hotdogs cooked together) But this is a little different.
1 lb browned & seasoned ground beef (salt, pepper & garlic to taste)
2 28 oz cans of Bush's baked beans (any flavor)
Combine meat and beans in a casserole dish. Cover with lid or foil and bake at 400 for 30 minutes. The flavor of the beans will determine the flavor of the casserole. Remove from oven and uncover, then allow to cool for 10 minutes before serving. This is one of those things that tastes even better the next day when the flavors have had time to soak into the meat.