Preheat oven to 350.
Mix all of the cake ingredients together in a bowl. I mixed mine by hand and it worked perfectly.
Spread half of the cake mixture into a greased 9x13 pan. It’s a little bit difficult to spread and it should be a thinner layer.
Spread the jam on top of the cake layer.
Drop the second half of the cake batter by the spoonful on top of the jam. This should mostly cover the jam but you can spread it a little to help cover the jam. It’s okay if the jam shows through.
Mix together the crumb topping ingredients. It will be a dry mixture.
Sprinkle the crumb topping over the top of the cake layer.
Bake for 25-30 minutes.