Preheat your oven to 350?F (175?C).

Prepare a baking dish by greasing it lightly with butter or lining it with parchment paper.

Mix the butter and sugar in a large bowl until light and fluffy (3-5 minutes).

Add the eggs one at a time, mixing well after each addition.

Sift together the flour and baking powder in a separate bowl.

Combine the dry ingredients with the butter mixture gradually, stirring gently until just incorporated.

Fold in your favorite fruit jam or preserve, spreading it evenly through the batter.

Pour the batter into your prepared baking dish and smooth out the top with a spatula.

Bake in your preheated oven for 25-30 minutes or until a toothpick inserted in the center comes out clean.

Cool the cake in the pan for about 10 minutes before transferring it to a wire rack to cool completely.

Dust with powdered sugar before serving for an elegant touch (optional).