Tater Tot Chicken Pot Pie

Name: Tater Tot Chicken Pot Pie
Ingredients: 3 tbsp. unsalted butter; 1 small or 1/2 large yellow onion, finely chopped; 2 medium carrots, peeled, finely chopped (about 1 c.); 1 large stalk celery, finely chopped (about 1 c.); 3 cloves garlic, finely chopped; 2 tsp. fresh thyme leaves; Kosher salt; Freshly ground black pepper; 3 tbsp. all-purpose flour; 2 1/2 c. low-sodium chicken broth; 1/4 c. heavy cream; 3 c. shredded rotisserie chicken; 1 c. frozen peas; 1 (32-oz.) bag frozen tater tots