Apple and Blueberry Crisp

First, preheat your oven to the optimal temperature of 375 degrees Fahrenheit (or 190 degrees Celsius). Next, take a 9x13-inch baking dish and apply a thin layer of butter to prevent the mixture from sticking.

Then, combine 2 cups of whole wheat flour, 1 cup of rolled oats, and 1/2 cup of butter in a mixing bowl. Add 1/2 cup of brown sugar, 1/2 cup of white sugar, 1 teaspoon of ground cinnamon, and a pinch of kosher salt. Use an electric mixer to blend the ingredients until they form small clumps, taking around 3-5 minutes.

After that, place the bowl in the refrigerator to chill until you're ready to use it.

Then, take a large mixing bowl and combine the following ingredients: blueberries, apples, 1/4 cup of brown sugar, 1/4 cup of white sugar, 2 tablespoons of whole wheat flour, some freshly squeezed lemon juice and zest, the remaining 1 teaspoon of ground cinnamon, and a pinch of nutmeg.

Next, transfer the fruit mixture to the prepared 9x13-inch baking dish. Finally, sprinkle the chilled oat mixture evenly over the top of the fruit.

Finally, place the baking dish in the preheated oven and bake until the topping is golden brown and the fruit is bubbly, taking around 35-45 minutes.