Preheat oven to 350 °. Line a baking sheet with parchment paper. Combine oats and almonds in a blender or food processor and pulse until they're the texture of sand.
Add ½ cup maple syrup, the vanilla extract, and salt. Then add butter, cut into even slices. Pulse until combined.
Turn dough out onto prepared baking sheet and using wet hands press out into a rectangle and brush with the egg.
Bake the crust until browned, rotating halfway through, about 25 minutes.
Let cool 10 minutes before transferring to a cutting board using 2 spatulas or one large one.
Before serving, combine cream and the remaining 3 tbsp of maple syrup in a large mixing bowl and whisk until stiff peaks form. Gently fold in yogurt. Spread the cream over the crust and arrange with the cut up berries!
Notes
How can the kids help?Help measure everything out and press the buttons when blending.