Preheat oven according to directions on cornbread mix for cast-iron baking. Prepare Mexican-Style Beef Sausage. Add onion and pepper mix and tomatoes; cook 3 minutes, stirring occasionally.
Mexican-Style Beef Sausage: Combine 1 pound Ground Beef (93% or leaner), 2 tablespoons red wine vinegar, 1-1/2 teaspoons dried oregano leaves, 1-1/2 teaspoons smoked paprika, 1-1/2 teaspoons chili powder, 1 teaspoon garlic powder, 1/2 teaspoon salt and 1/2 teaspoon chipotle chili powder in large mixing bowl mixing lightly but thoroughly. Heat 9-inch cast iron skillet over medium heat until hot. Add sausage mixture; cook 8 to 10 minutes, breaking into 1/2-inch crumbles and stirring occasionally.