Preheat oven to 400°F. Line 24 muffin cups with paper baking cups. Set aside.
Brown ground beef in a large skillet on medium-high heat. Drain fat. Stir in Seasoning Mix and water. Bring to a boil. Reduce heat to low; simmer 5 minutes, stirring occasionally.
Prepare corn muffin mix as directed on package. Spoon scant 2 tablespoons of batter into each muffin cup. Place heaping 1 tablespoon taco meat, 1 tablespoon salsa, and 1 tablespoon cheese in the center of each cupcake. Top each cupcake evenly with remaining batter.
Bake 15 to 17 minutes or until a toothpick inserted into the cupcake comes out clean and cupcakes are golden brown. Cool cupcakes slightly. Frost tops with sour cream. Sprinkle with cilantro.
