Preheat the oven to 375 degrees (190 degrees C). Spray an 8- or 9-inch square baking dish with cooking spray, and set aside. Finely chop pepper tops, and set aside.

Heat a large nonstick skillet over medium-high. Cook chorizo and corn until corn begins to turn golden and chorizo begins to brown about 5 minutes. Add ground beef and cook until browned, about 10 minutes.

Stir 2 cups water, Knorr® Fiesta Sides™ - Spanish Rice, and chopped pepper tops to the skillet. Cook according to package directions. Stir in 3/4 cup cheese and let stand 2 minutes. Stuff peppers equally with rice mixture and arrange in the prepared baking dish. Add 2 tablespoons water to the baking dish and cover tightly with foil.

Bake until peppers are tender, about 45 minutes. Remove and discard the foil. Sprinkle peppers evenly with remaining 1/4 cup cheese. Continue to bake until the cheese melts, about 2 minutes.