Heat 1 tablespoon olive oil in a cast-iron skillet over medium heat. Slice the fully cooked sausage into coin-sized pieces and add them to the skillet. Cook the sausage for about 5 minutes on one side, then flip and cook for another 3 minutes on the other side, until browned and heated through. Remove the sausage from the skillet and transfer it to a large plate. I find that browning the sausage really boosts its flavor and gives the dish a nice smoky depth.
After cooking the sausage, you will have some oil left in the skillet. Leave a bit of it for the vegetables, and transfer the extra to a small heat-proof bowl to reserve for later. Add the diced red bell pepper to the same skillet and cook over medium heat for about 4 minutes, stirring occasionally. If the skillet becomes too dry and the pepper starts to stick, add a little of the reserved oil as needed. Once cooked, remove the bell pepper and add it to the plate with the sausage.
In the now empty skillet, add the sliced zucchini. Cook over medium heat for about 3 minutes, stirring as needed to ensure even cooking. If necessary, add more reserved oil to prevent the zucchini from sticking. Once tender and slightly browned, remove from the skillet and transfer to the plate with the sausage and bell pepper.
Carefully slice the cooked corn kernels off the cob if you haven't done so already. In the same skillet, combine the cooked sausage (from Step 1), cooked bell pepper (from Step 2), cooked zucchini (from Step 3), and 2 cups cooked corn kernels. Mix everything together thoroughly. Add the reserved oil from the sausage and sprinkle in the chili powder. Reheat the mixture over low heat, stirring well to ensure it’s evenly seasoned. I like to let the mixture sit for a minute or two on low—this helps all the flavors meld together beautifully.
Remove the skillet from the heat. Top the finished dish with a generous sprinkling of chopped fresh cilantro. Serve hot and enjoy! Personally, I think a squeeze of fresh lime would also pair wonderfully with these flavors, if you have some on hand.