Chicken Pot Hotdish

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3 tablespoons unsalted butter

3 carrots, chopped into 1/2-inch pieces 

1 large onion, finely chopped 

Kosher salt 

6 tablespoons all-purpose flour 

3 cups whole milk 

Chicken soup mix for 3 cups broth (about 1 tablespoon)

1 1/2 pounds boneless, skinless chicken thighs, chopped into 1/2-by-3/4-inch pieces 

3/4 cup frozen peas 

1/2 teaspoon dried thyme 

Freshly ground black pepper 

1 1/2 pounds frozen tater tots 

Ketchup, for serving, optional