Preheat oven to 350 degrees
Prepare a 9x13 baking pan by liberally spraying with baking spray
In a mixing bowl of stand mixer or in a large mixing bowl cream together the butter and sugar, then add the remaining ingredients (except the strawberry jam) to the bowl and mix until combined.
Spread half of the batter mixture in the baking pan. You may need to use your hands to spread the batter, it's thick!
Spread jam onto batter in the pan in an even layer.
Cover with remaining half of batter, doing your best to spread evenly over the top.
Make the streusel, by combining all the ingredients in a small bowl and mixing until well combined with a fork (or your fingers). It should look a bit like wet sand.
Sprinkle the streusel over the cake evenly. Then put the cake into the 350 degree oven.
Bake for 45-50 mins until toothpick inserted into middle comes out clean and top is golden brown.
Let cool about 30 minutes and serve warm!