Cinnamon Coffee Crumb Cake

Instructions

1. Preheat the oven to 350F and grease a 9x5 baking dish, lining the bottom with parchment paper.
2. For the topping, put the softened butter, flour, brown sugar, cinnamon, and other spices (optional) in a bowl and massage together with your hands or a fork until coarse crumbs form. If you're finding it's not getting crumbly enough, add flour 1 tsp at a time and continue combining.
3. In a large mixing bowl, or the bowl of a stand mixer, cream together the butter and sugar until smooth and light in color. Scrape down the sides occasionally with a spatula.
4. Add the vanilla and egg, mix in.
5. In a separate bowl, sift and whisk together the flour, baking powder and salt.
6. Add a third of the flour to the wet mixture and fold until just incorporated. Fold in the milk, and when combined, add the rest of the flour.
7. Pour all the cake batter in the baking dish, and spread to all edges evenly (an offset palette knife works well for this).
8. Sprinkle the topping over the batter evenly, and press lightly with your hand to flatten and adhere it to the cake.
9. Bake in preheated oven for around 45 minutes, or until a toothpick comes out clean. Cool completely on a wire rack before serving.