Mix 2 tablespoons of orange juice and 1 tablespoon of cornstarch in a small dish or measuring cup.
Add the raspberries, maple syrup, and the orange juice cornstarch mixture to a medium saucepan. Heat on medium until the mixture starts to simmer. Continue simmering, stirring frequently and mashing the berries for 15-20 minutes until the sauce thickens and the raspberries break down.
Remove the raspberry mixture from the heat and stir it to let it cool a little while you prep the baking dish.
Preheat the oven to 350 F (176 C).
Combine the almond flour, oats, coconut sugar, and salt in a medium bowl and toss to combine.
When the raspberry mixture is thick, remove it from the heat.
Add the vanilla and ½ cup of orange juice to the oat mixture. Stir the mixture to moisten the ingredients.
Spread half the mixture on the bottom of a small baking dish (mine was 5.5x9 inches). Press it into the bottom using the back of a spoon.
Next, spread the raspberry filling evenly over the bottom layer.
Use your fingers to sprinkle the remaining oat mixture over the top, covering the raspberry layer.
Place the baking dish in the oven and bake for 30-35 minutes until the top is brown. Remove from the oven and cool on a wire rack before cutting.