Brown ground beef - drain well. Add Fajita seasoning and 1/2 cup water. Let cook 2 mins. Add drained tomatoes, stir well. Add pork & beans and corn, stir well. Stir in half the grated cheese. Srpay casserole dish with cooking spray - add layer of crushed Doritos (you decide amount but I like to make sure the bottom of the casserole dish is completely covered and then some). Pour mixture over Doritos. Bake at 375* until bubbly and heated through. Remove from oven and top off casserole with remaining shredded cheese followed by another layer of crushed JDoritos. Return to oven additional 5 mins. Optional - you can use a can of Rotel tomatoes with chilis if desired. Sooo good!