Step-by-Step Instructions

1. 1.Arrange Apples

   Arrange 3 cups of cored and sliced apples into a 9-inch pie plate.

2. 2.Prepare Crumble Mixture

   In a bowl, combine 1 cup of melted unsalted butter, 2 cups of rolled oats, 1 cup of all-purpose flour, 1 cup of chopped walnuts, and 1 teaspoon of ground cinnamon. Stir until a crumbly mixture forms, resembling wet sand.

3. 3.Top Apples

   Top the arranged apples with the prepared oat mixture, spreading it evenly.

4. 4.Bake

   Bake the apple crumble in a preheated 350°F oven for 1 hour or until it is golden brown.

5. 5.Serve

   Serve the Irish Apple Crumble warm with a dollop of whipped cream.