Preheat oven to 400 degrees F.
In a large oven-going skillet brown ground beef with onion and garlic until no longer pink. Drain grease if needed. Sprinkle with flour and stir to mix well. Stir in milk, broth, and simmer until slightly thickened. Stir in vegetables.
Top with biscuits and sprinkle with thyme if desired. Bake for 20 minutes or until golden.