Hamburger Casserole

Name: Hamburger Casserole
Ingredients: 1 lb. Yukon gold potatoes, peeled and quartered; kosher salt; Black pepper; 1/4 c. lowfat sour cream; 1/4 c. whole milk; 2 oz. extra-sharp Cheddar, coarsely grated; 1 tbsp. olive oil; 1 large onion, chopped; 1 large carrot, cut into 1/4 pieces; 1 lb. ground beef (at least 90% lean); 1 tbsp. tomato paste; 1/8 tsp. ground cinnamon; 1 tbsp. flour; 1 tsp. ground cinnamon; 1 tsp. fresh thyme leaves; 1 14.5 oz. can petite diced tomatoes, drained; 1 c. low-sodium beef or chicken broth