Spray an 8x8" baking pan with cooking spray. Preheat the oven to 350º Fahrenheit.
In a bowl, use a pastry blender (or two knives) to cut together the flour, cold butter cubes, sugar and 1 teaspoon of vanilla extract. Cut together until the mixture is coarse crumbs.
Measure out 1 cup of crumbs and set aside so you can use them for the topping.
To the remaining crumbs, add 1 teaspoon baking soda, buttermilk and the remaining teaspoon of vanilla.
Mix just until combined.
Pour the batter into the prepared pan, spreading to cover the entire bottom of the pan evenly.
Sprinkle the reserved crumbs on top of the cake batter.
Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.
Store in an airtight container at room temperature.
The calories shown are based on the cake being cut into 9 pieces, with 1 serving being 1 slice of cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information. The information in the nutrition box are calculated through a program and there is room for error. If you need an accurate count, I recommend running the ingredients through your favorite nutrition calculator.**