In a 10-in. ovenproof skillet, cook pork in oil until browned, about 4 minutes. Add potato, onion, garlic and green pepper; cook and stir for 4 minutes. Stir in tomatoes, bouillon, cumin, salt, pepper and cayenne. Cover and cook over low heat for 30 minutes or until potatoes are tender, stirring occasionally. Make four wells in the hash; break an egg into each. Bake, uncovered, at 350° for 10-12 minutes or until the eggs are completely set. Sprinkle with cheese; cover and let stand for 5 minutes. Serve over tortillas.