Heat 1 tablespoon olive oil in a large skillet over medium heat.
Add the chopped onion and chopped bell pepper. Cook, stirring occasionally, until soft, about 4 to 5 minutes.
Add the ground beef. Cook, stirring occasionally, until the ground beef is cooked through, about 4 to 5 minutes.
Stir in the chiles, corn, 1 teaspoon chili powder, cream of mushroom soup, milk, and salt.
Transfer the mixture to a 13x9-inch baking dish.
Sprinkle the cheese over the top.
In a small bowl, combine the remaining 2 tablespoons olive oil with the smoked paprika, garlic powder, dried oregano, and remaining 1 teaspoon chili powder.
Transfer the frozen tater tots to a large bowl, and pour the seasoned oil over the top. Toss to combine.
Arrange the tater tots in even rows over the top of the cheese.
Bake for 30 minutes, or until the cheese is melty and the tater tots are golden brown.
Sprinkle chives over the top, if desired, and serve.