Step 1

Preheat the oven to 350 F (176 C).

Step 2

In a large bowl, whisk together the flour, oats, brown sugar, baking powder, and sea salt. Pour in the melted butter and stir to combine.

Step 3

Grease an 8 x 8 baking dish, and then line it with parchment paper. Press 2/3 of the crumble mixture into the bottom to form the crust, and then bake for 10 minutes.

Step 4

In a medium bowl, stir together the raspberries, granulated sugar, cornstarch, and lemon juice.

Step 5

Pour the raspberry filling onto the crust, and then sprinkle the remaining crumble topping on top of the raspberries. I like to spread it out as evenly as I can, but the raspberries won’t be completely covered. I also like to press the topping gently into the raspberries.

Step 6

Bake the bars for an additional 25 - 30 minutes, or until the top of the crumble looks golden and the filling looks set.

Step 7

Allow to cool to room temperature before serving.