Mix the almond flour, oats, sugar, vegan butter, baking powder, and salt together in a large bowl.
In a small food chopper or a food processor, pulse the strawberries, sugar, cornstarch, and lemon zest.
Spread ¾ of the oat base on the bottom of a medium (9x7) baking dish. Tap in gently to help it set.
Pour the strawberry filling on top and spread it out evenly.
Sprinkle the rest of the oat base over the top.
Bake at 350°F for 40-45 minutes. Let it cool completely before cutting into squares.
How to Make Oat Flour
If you have a nut allergy, or just don't have any almond flour on hand, you can also make your own oat flour. It's easy! Just process oats in a food processor until they've broken down to the consistency of flour. Use what you need and store any leftovers for another recipe.
Variations to this recipe
Substitute different fruits. Blueberry, raspberry, peach, and apple are just some of the tasty options for these oatmeal bars.
Make it gluten-free. Oats don't have naturally occurring gluten, but because of cross-contamination during processing, use certified gluten-free oats for any allergies.
Try different sweeteners. You can avoid refined sugar by using pure maple syrup, agave syrup, or date syrup in these bars.
Add a topping. If you want to up the pretty factor, layer slices of fresh strawberries on top of the bars before serving. Or for a bit of sweet, you can make a simple glaze and drizzle it over the cooled bars.
How to Store these Strawberry Oatmeal Bars
Store any leftover Strawberry Oatmeal Bars in an airtight container in the refrigerator for up to 5 days.