INGREDIENTS
1 tbsp
unsalted butter
1
yellow onion
2 cloves
garlic
1 1/2 cups
heavy cream
1/2 cup
low sodium chicken broth
2 tsp
fresh thyme leaves
1 1/2 tsp
kosher salt
1/2 tsp
ground pepper
2 lb
russet potatoes
1/2 cup
shredded cheddar
1/2 cup
gruyere cheese