Spray 9x9 pan and line with parchment paper if you want to lift out for easy cutting. Parchment paper is optional.
Put the flour, sugar, baking powder, salt and cardamom in bowl and mix to combine.
Cut the butter into small pieces and add to flour mixture. Mix with pastry cutter or fork until well distributed and in very small pieces (like small peas).
Measure out 1 cup of mixture and set aside.
Whisk together the wet ingredients and mix with the dry, just until combined. Spread the batter into the pan, and sprinkle reserved crumbs evenly over top.
Bake for 40-45 minutes, until toothpick comes out clean.
Notes
You can substitute cinnamon or allspice for the cardamom.This is a tall cake so do not use a smaller pan or you will have too much batter.