Preheat oven to 180 degrees. Line and grease a 13 x 9 inch pan and set aside.

In a mixing bowl, beat the butter and sugars till fluffy.

Add the yogurt in and beat till combined. The mixture may curdle but it is OK.

Add the coffee and beat in.

Sift in the flour, baking powder and salt. Add the cinnamon chips. Fold the mixture in till just combined and all moist.

Spread onto the prepared tin and bake for 30-40 minutes or till a skewer comes out clean.

Cool in pan for five minutes before flipping onto a cooling rack.

Allow to cool completely before cutting into squares and serving.