Preheat the oven to 350 degrees. Spray a muffin tin with nonstick spray. Brown and cook the hamburger meat in a skillet. Stir in the water and taco seasoning and cook for 2-3 minutes longer. Whisk the eggs in a large bowl. Stir in the taco meat, beans, tomatoes, green peppers, onion, and cheese. Spoon into the prepared muffin tins. Bake for 25 minutes. Remove from the oven and let cool 1-2 minutes. Use a knife to go around the edges of the egg muffins to loosen them. Remove and cool on a wire rack. Makes 20 egg muffins. Store in a sealed container in the refrigerator. Or place in ziplock bags and freeze until you need them. Reheat refrigerated egg muffins for 30-45 seconds. Reheat 2 frozen egg muffins for 1 1/2 minutes. Serve with salsa, yogurt, and avocados, if desired.