Parmesan-Crusted Au Gratin Potatoes and Onion

INGREDIENTS

4 lb

russet potatoes, cut into 1/4-inch slices

salt and ground black pepper

6 tbsp

butter

6 tbsp

all-purpose flour

1 1/2 cups

whole milk

1 cup

heavy whipping cream

2 1/2 cups

shredded mild Cheddar cheese

1 cup

shredded Asiago cheese

sweet onion, sliced into rings

3/4 cup

sliced green onions

1/3 cup

shaved Parmesan cheese

buttery round crackers (such as Ritz®), crushed

2 tbsp

chopped fresh parsley