Beef and Gravy

1 lb ground beef
1/2 onion, diced
various frozen vegetables (or leftover cooked veggies from other meals)
enough mashed potatoes for the whole family
2 packets brown gravy mix
tomato paste

Saute onion in large frying pan in a little olive oil. Add ground beef. Season with salt, pepper, garlic powder and oregano. Break up and brown. Add veggies, tomato paste, gravy mix and 2 cups water. Whisk and bring to a boil. Simmer until gravy is thickened and veggies are soft. Serve over mashed potatoes.