Preheat oven to 350 degrees. Grab a 9 inch cake pan or 8×8 or 9×9 square pan.
In a medium bowl, combine berries, maple syrup, lemon juice, lemon zest and cornstarch. Stir to combine.
Pour berries into pan.
Rinse and dry bowl. Add oats, almond flour and brown sugar to bowl. Stir.
In a smaller bowl, combine oil, Greek yogurt and vanilla. Stir.
Pour oil mixture into oat mixture and stir well.
Using your hands, evenly distribute oat mixture over the top of the berries.
Bake for 40 – 45 minutes or until brown and bubbly at the edges.