Preheat oven to 350°F. Line a 9x9 inch pan with parchment paper, with overhang on the sides. (to lift the bars up out of the pan after cooling.

Spray with pan coating and set aside.

In a large mixing bowl, combine oat flour, old fashioned oats, sugars, baking soda and salt. Mix well.

Melt the butter in a microwave safe bowl at 30 second intervals until completely melted.

Pour margarine and vanilla over the dry ingredients. Mix using a spatula until mixture is thoroughly moistened and resembles a crumble.

Pull 1 cup of crumble mixture out of the bowl and set aside.

Add 1 tbsp of water to the remaining mixture in the bowl. Mix to moisten. Transfer the remaining crumble into the baking pan. Press the crumb into the bottom creating a smooth layer.

If your berry jam is thick, microwave it for 30 seconds to loosen it up. Spread the jam or preserves evenly onto the smooth crumb crust using a spatula or spoon.

Sprinkle fresh fruit and remaining crumble evenly across the jam layer.

Bake in the oven for 25-30 min until jam is bubbly and crumb topping is golden. Remove from the oven and allow to cool completely.

Once cooled, remove the bars out of the pan by running a knife or spatula around the edges of the bars and pulling up on the parchment. Cut into 12 squares and enjoy!