Preheat the oven to 350°F and grease a pie dish with cooking spray, butter, or coconut oil.
Wash the apples and strawberries. Remove the core from the apples and slice into very thin pieces. I like apples baked with their skin on; however, if you do not, remove it prior to baking. Remove the stem from the strawberries and cut into thin slices.
Place fruit in a large mixing bowl and toss with cornstarch, white sugar, lemon extract, and lemon zest.
Pour the coated fruit mixture into the greased pie dish. In that same mixing bowl, add all of the dry ingredients: brown sugar, oats, flour, cinnamon, and salt.
Toss them together, and then pour in the MELTED coconut oil. Fold together until all dry ingredients are coated with the oil. It will be a crumble-like texture.
Then, dump Oatmeal Streusel Topping onto fruit and use your hands to spread the crumble around for an even distribution.
Cover the fruit crisp with tin foil and bake for 25 minutes. Remove the tinfoil and then bake for another 20 minutes until the fruit is tender.
Enjoy warm - top with vanilla ice cream, whipped cream, or just with a spoon!