Cheesy Funeral Potatoes (Au Gratin Potatoes)

INGREDIENTS

Russet potatoes (about 30 ounces), large

1/4 tsp

Thyme, dried

Yellow onion, large

3 3/4 oz

cornflakes

1 1/2 cups

Chicken broth, low-sodium

1/4 cup

All-purpose flour

1/2 tsp

Pepper

1 1/2 tsp

Salt

5 tbsp

Butter

2 cups

Cheddar cheese, sharp

1 cup

Milk

1/2 cup

Sour cream, light or regular