Coffee Crumble Cake

In a bowl, combine brown sugar, salt, and flour.

Grate the chilled butter - combine well.

Place in the fridge to keep chilled.

Grease and line a 9 x 9-inch square cake pan.

Preheat the oven at 160 C / 320 F.

Combine flour with baking powder, baking soda, and salt - set aside.

Whip together the eggs and oil.

Add the sugar, followed by the sour cream.

Next, add the vanilla.

Lastly, add the flour mixture. Combine well.

Pour into the prepared baking pan. Use an offset spatula to spread evenly.

Generously top with the prepared streusel mixture.

Bake for 35 to 40 minutes or until a skewer inserted in the center comes out clean.

Let cool in the pan for at least 10 minutes before slicing.