Preheat oven to 350F.
Spray a 9" square tin with oil and line with baking/parchment paper with overhang (so it can be lifted out once cooked).
Mix together butter, flour, oats, sugar, baking powder and salt until you can no longer see white bits of flour. Add egg and mix
Place 2½ cups of the mixture in the tin and press into base. Spread with Herkner Farms, Farm House Berry Preserves then use your hands to crumble the remaining mixture over the top
Bake for 30 - 35 minutes or until the top is deep golden. Remove and allow to cool in the tin before lifting out of the tin using the baking paper.
Cut into squares. Serve at room temperature. Store in airtight container