Take a skillet and add ground beef, onion, and red peppers to it. Cook over medium heat for 5 minutes or until and ground beef is browned and no moist is left.
Now add fajita seasoning and can bean. Keep stirring.
Take a separate bowl and add cornbread mix, milk, and egg. Spread evenly over the ground beef mixture in skillet.
Put it in the oven and bake at 350 degrees for 20-25 minutes. Insert the toothpick in the middle, if it comes clean, then Cowboy Cornbread Casserole is ready.
Let cool it cool for 10-15 minutes before slicing and serving.