Cardamom streusel coffee cake perfect for the weekend

– 100g melted butter + 1/2 cup oil.

– 1/4 cup white sugar (for sprinkling on the pan).

– 1 cup sour cream or yogurt.

– 1 tbsp vanilla extract.

– 2 shots of espresso or 1/4 cup strong coffee.

– 2 1/2 cups self-raising flour.