• Heat the oven to 350 degrees Fahrenheit.
• Generously butter a 9x13 inch baking dish or an oval 9x14x2 inch baking dish.
• Peel 5 large tart apples such as Granny Smith and 5 large sweet apples such as Gala (or 5 lbs. of McIntosh or Macoun apples if you can find them).
• Dice the apples into chunks, making sure they are all relatively the same size to ensure that they cook evenly. Place the diced apples into a large mixing bowl.
• Using a Microplane, add the zest of 1 whole lemon and 1 whole orange. Cut both the lemon and orange in half and squeeze 2 Tbsp. of lemon juice and 2 Tbsp. of orange juice into the bowl of apples.
• Add ½ cup of granulated sugar, 2 tsp. cinnamon, and 1 tsp. nutmeg to the apples. Stir all of the ingredients until completely combined. Set aside.

For The Streusel Topping:

• Cut ½ lb. (equals 2 sticks) of cold unsalted butter into chunks.
• Add 1 ½ cups gluten free flour blend (or AP flour if not gluten free), ¾ cup granulated sugar, ¾ packed cup brown sugar, 1 cup gluten free old fashioned rolled oats (or regular old fashioned rolled oats if not gluten free), ½ tsp. kosher salt, and the diced butter to the bowl of a stand mixer.
• Place the paddle attachment onto the stand mixer and mix the streusel on low speed until the mixture is crumbly and roughly the size of peas.

  The streusel topping may also be prepared using a hand mixer on low speed.
• Pour the apple mixture (along with any juices) into the baking dish and spread them evenly over the dish. Pour the streusel topping evenly over the apples until they are completely covered.
• Place the baking dish in the oven and bake for one hour, or until the apples are hot and bubbly and the streusel topping crisp and slightly browned. Remove the apple crisp when it has finished baking.

For The Whipped Cream (optional):

• Pour 2 cups of cold heavy whipping cream into the bowl of a stand mixer (feel free to add 2 Tbsp. of sugar or sweetener of choice for sweeter whipped cream).
• Using the whisk attachment, mix the whipped cream on medium speed for 3-4 minutes, or until it forms stiff peaks (alternately, you can use an electric hand mixer).
• To Serve: Allow the apple crisp to cool slightly before serving. Serve with homemade whipped cream or ice cream (optional).