In large nonstick skillet, brown beef over medium-high heat, about 5 minutes. Drain off fat.
Retum skillet to heat and add onion, peppers and seasoning; cook, stirring often, for about 5 minutes or until onions are softened. Add tomatoes, breaking up with back of spoon; bring to boil. Reduce heat; simmer for 15 minutes or until thickened.