Preheat oven to 425 degrees.
In oven ready skilled, add oil, onions beef, salt and pepper over medium heat, until completely cooked.
Add garlic powder, taco seasoning mix, and 3/4 cup water, and stir to combine.
Remove from skillet and set aside.
Evenly spread the diced pepper into the skillet and spoon the beef mixture on top, spreading evenly.
In bowl combine final 6 ingredients until a semi-smooth batter forms. Pour this batter evenly over the beef in skillet.
Bake for 45 to 50 minutes or until the cornbread is cooked thoroughly and is golden brown around the edges.