Apple Crisp with Oatmeal Walnut Streusel Topping

Preheat the oven to 400 F.

Peel, core, and cut the apples into 1/2-inch wedges and place in a bowl. Pour in lemon juice and toss to prevent browning. Add 2 tablespoons granulated sugar, 1/8 teaspoon cinnamon, 1/4 cup flour, and vanilla extract and stir to combine. Transfer to a buttered 8-inch by 8-inch square or oval baking pan. Scatter the walnuts and pieces of butter on top of the apples.

To make the topping, combine the oats, brown sugar, nuts, flour, salt, and spices in a medium sized bowl. Cut in the butter using a pastry blender, a fork or two knives. Spread the topping evenly over the apples.

Bake until the topping is golden brown and the apples are bubbling, about 35 to 40 minutes. Cool slightly on a wire rack.

Spoon warm apple crisp into bowls and serve with vanilla ice cream.

Adapted from Mad Hungry, Lucinda Scala Quinn, Artisan, 2009 (posted on Martha Stewart).