Instructions

1. Preheat the oven to 350 degrees F.
2. Add the butter and sugar to a stand mixer with paddle attachment (or mixing bowl with electric beaters) and cream together.
3. Add the salt and vanilla extract and continue mixing.
4. Slowly add the flour until a crumbly dough forms.
5. Press the dough into a greased 8x8 baking dish.
6. Bake for 15 minutes.
7. Add all filling ingredients to the mixer bowl and blend well on medium speed.
8. In a separate bowl, prepare the streusel topping by cutting the flour and brown sugar into the butter using a pastry blender until crumbly. Stir in the oats last.
9. Add the filling to the top of the crust, and top with streusel topping.
10. Bake in the oven for 20 minutes, until the streusel is a golden brown.