Add olive oil to a large, oven-proof skillet over medium-high heat. Sauté the onion and bell pepper until softened, about 4 minutes. Then add the garlic and continue to sauté until fragrant, about 1 minute.
Meanwhile, microwave the Del Real Carnitas for 1 minute, 30 seconds and set aside.
Pour the taco seasoning, green chilies, enchilada sauce, diced tomatoes, and carnitas into the skillet. Break apart the carnitas and mix them together with everything in the skillet until combined. Turn the heat down and allow to simmer for a few minutes.
Preheat the oven to 375F. Whisk together the cornbread mix, egg, milk, sour cream, corn, and half of the Pepper Jack cheese in a large bowl. Sprinkle the saucy carnitas in the skillet with the remaining cheese. Next, evenly spread the cornbread mix on top over the saucy carnitas.
Bake for 30 minutes, or until the cornbread has set and starting to brown.
Remove the tamale pie from the oven and let it sit for at least 10 minutes before serving. Serve with desired suggested garnishes and enjoy!