2 cups whole milk
1 cup plain yellow cornmeal
2 tablespoons vegetable oil
2 cups chopped yellow onion (~2 medium onions)
1 tablespoon minced garlic (~3 garlic cloves)
1 large green bell pepper, chopped (~1 cup)
1 pound ground beef
2 cups tomato sauce
1 cup frozen or canned corn, drained
1 cup canned sliced black olives, drained
2 tablespoons plus 1 tsp. chili powder
2 teaspoons kosher salt
1/2 teaspoon black pepper
6 ounces extra-sharp Cheddar cheese, shredded (about 1 1/2 cups)
Sour cream (optional)
Chopped fresh cilantro (optional)
Preheat oven to 350°F. Stir together milk and cornmeal; set aside.
Heat oil in a large skillet over medium-high. Add onion, garlic, and bell pepper; cook, stirring occasionally, until the vegetables begin to soften, about 8 to 9 minutes. Add beef; cook, stirring often, until meat crumbles and is no longer pink, about 7 minutes.
Stir beef mixture into cornmeal mixture. Stir in tomato sauce, corn, olives, chili powder, salt, and black pepper. Transfer to a lightly greased 13- x 9-inch glass or ceramic baking dish.
Bake in preheated oven until set and well browned around edges, 55 minutes to 1 hour. Remove from oven; sprinkle with cheese. Return to oven, and bake until cheese melts, 3 to 4 minutes. If desired, top servings with a dollop of sour cream and sprinkle with cilantro.