A recipe from King Arthur flour.
9 cups peeled, sliced apples 1/4 cup rum, apple cider or juice, or the liquor/juice of your choice; or water 1/4 to 3/4 cup brown sugar, depending on the sweetness/tartness of your apples 2 tablespoons melted butter 2 tablespoons boiled cider, optional but good 1 1/2 teaspoons Apple Pie Spice (1 teaspoon ground cinnamon + 1/4 teaspoon ground nutmeg + 1/4 teaspoon ground ginger) 3 tablespoons all-purpose flour or tapioca flour 1/4 teaspoon salt Topping: 3/4 cup all-purpose flour 1/2 cup quick oats heaping 1/4 teaspoon salt 2/3 cup brown sugar, light or dark 1 teaspoon ground cinnamon 3/4 teaspoon baking powder 1/2 cup (8 tablespoons) cold butter, cut in pats 1/2 cup diced pecans or walnuts, optional
Preheat your oven to 350 degrees. Grease a 9″ x 9″ square cake pan, or similar-size casserole pan.
Slice the apples about 1/4″ thick. Toss them with the remaining filling ingredients, and spread them in the pan.
To make the topping, whisk together the flour, oats, salt, sugar, cinnamon, and baking powder. Add the cold butter, working it in to make an unevenly crumbly mixture. Spread the topping over the apples in the pan.
Set the pan on a parchment- or foil-lined cookie sheet, to catch any potential drips. Bake the crisp for about 60 minutes, till it’s bubbling and the top is golden brown.
Remove it from the oven, and allow it to cool for at least 20 minutes before serving. If you serve the crisp hot/warm, it may be quite soft. If you wait till it’s completely cool, it’ll firm up nicely. A good compromise is to wait for it to cool completely, then reheat individual portions briefly in the microwave. Vanilla ice cream is a tasty accompaniment.