Heat 1 teaspoon olive or vegetable oil over medium heat in large skillet. Add chopped onions and green pepper, cook 2-3 minutes, then add ground beef and brown meat. Drain extra juices from skillet. Add tomato sauce, chili powder and salt, mixing well. Simmer 15 minutes, stirring occasionally. Heat oven to 350°F. Spray 13x9-inch glass baking dish with cooking spray. In a saucepan, bring water to a boil, slowly stir in grits and taco seasoning mix. Reduce heat; simmer 3 to 5 minutes or until very thick, stirring occasionally. Spread grits mixture over bottom of prepared baking dish, pushing against sides of dish to form a shell. Spoon hot beef mixture into shell.* Bake 20 to 25 minutes or until heated through. Top with cheese and tomato and serve.