Step 1

Preheat the oven to 350 degrees. Place raspberries in a large colander. Run warm water over them for a minute, and then let the liquid drain out for about an hour until softened and thoroughly drained (see notes). Mix raspberries with sugar, flour, cornstarch, and lemon juice.

Step 2

Mix the oats, flour, sugar, baking powder, butter, and salt together into a crumble-like mixture. Press two thirds of the crumble into the bottom of a 9×13 pan lined with parchment paper. Bake for 10 minutes.

Step 3

Arrange the raspberry layer on top of the baked bottom layer. Sprinkle with remaining crumble. Bake for another 25-30 minutes.

Step 4

Remove from oven. They will need a little time to set up into “bar” formation, so chill them for a few hours to get them really solid. Orrrr… cut into it right away and eat it like a soft fruit crisp! You should be able to remove them from the pan easily by pulling up on the edges of the parchment paper.