Preheat oven to 350F
Mix flour, oats, sugar and baking soda together. Stir in the melted butter.
Scoop out 1 ½ cups of the mixture and press the rest into a parchment lined half sheet pan (13”x18”).
Spread jam on the base. Sprinkle remaining mixture on top.
Bake 45 minutes, cool before cutting.
