Preheat oven to 350F.
In a large bowl, mix together strawberries, maple syrup, lemon juice, and vanilla. Then add arrowroot starch and toss.
Add berries to an 8x11 (or 9x13) baking dish.
In another bowl, mix together oats, almond flour, and salt.
Stir in peanut butter, maple syrup, coconut oil, and vanilla until well combined.
Distribute crumble topping on top of strawberries until most of them are covered.
Bake in oven for 40-45 minutes or until topping is golden brown.
Let cool for 15 minutes before eating. Store leftovers in refrigerator.