I can’t seem to get tired of this recipe. It’s been a fixture on my menu lately

Ingredients:

4 cups thinly sliced potatoes
3 tbsp butter
1 1⁄2 cups milk
3 tbsp all-purpose flour
1 cup grated sharp cheddar cheese
1⁄2 cup grated cheese (cheddar or Gruyere) for topping
Salt to taste
1/2 cup sliced green onions (optional)
Pinch of cayenne pepper (optional)

Instructions: