Boil potatoes, drain and beat in mixer or mash by hand. Add butter and milk to potatoes while mashing.
Brown ground beef and onion. Drain grease. Add the bouillon and seasonings. Let the bouillon cubes soften a little bit, and then break them up into the ground beef with the seasonings. Add in flour an stir to a roux. Mix in water and let thicken slightly. Mix in frozen veggies.
Place beef and vegetable mixture in individual oven-safe bowls or large ramekin dishes. Top with mashed potatoes.