Easy Potato Gratin 3 russet potatoes (sliced into 1/4 inch slices) 1 onion (sliced into rings) 1/2 tsp pepper 3 tbsp all-purpose flour 1/2 tsp salt 1 1/2 cups oat milk 1 1/2 cups shredded Cheddar cheese (dairy free) Preheat oven to 400 °F Oil …