Preheat oven to 350 degrees F. Grease an 8x8 or 9x9 pan and set aside.
Mix the flour and sugar together, then cut in the butter with a pastry cutter until crust mixture resembles crumbs. Pat the crust evenly into bottom of the baking dish.
Bake the crust in the oven for 10-12 minutes until lightly browned. Remove and set aside.
Spread the jam over the top of the crust evenly.
Mix the topping ingredients together until there are no lumps and spread evenly over the top. Return to the oven. Bake for 25-35 minutes or until the filling is firm and set.
Remove and cool completely.
Cool, then slice and serve! These freeze exceptionally well.