To prepare a corn timbales cheese recipe, you'll first need to prepare the corn. Peel and cut the kernels off of the ears of corn and set aside. Cut the husks from the stalks of scallions and add them to the skillet. Heat the oil over medium-high heat. Add the chopped onion and cook until softened, about 5 minutes. Stir in the cheddar cheese. Cook until the cheese is melted and the onions are translucent, 2 to 3 minutes more. Remove the pan from heat, add the salt and pepper to taste, and stir to combine. Serve with guacamole.