Good-for-You Meat and Potatoes Casserole

Name: Good-for-You Meat and Potatoes Casserole
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: American
Ingredients: 16-20 oz. ground turkey or beef; 1/2 onion (diced); 1/2 tsp. oregano; 1/4 tsp. kosher salt; freshly ground black pepper; 2 cloves garlic (minced or crushed); 2 c. frozen mixed vegetables (carrots, peas, green beans, corn); 1 tbsp. butter; 1 tbsp. flour; 1 1/2 c. milk; 1/2 c. shredded cheese ((cheddar monterey jack, or a blend)); salt and pepper to taste; 1/2 c. sour cream (reduced fat is fine); 32 oz. bag frozen cubed or tri-cut potatoes (you will only need about 2/3 of the bag)