Preheat the oven to 400ºF. Line an 8 x 4-inch loaf pan with parchment paper, allowing 1-inch wings to hang over the edges on the long sides.

In a large bowl, toss together the marzipan and powdered sugar to coat. Add the chocolate and set aside.

In a food processor, combine the flour, baking powder, salt, and 2 tablespoons of the sugar and pulse to combine.

Add the butter cubes and pulse until the butter is the size of peas. Add this to the bowl with the marzipan.

In a small bowl, whisk together the eggs, buttermilk or cream, and extracts and add to the dry ingredients. Use a spatula to stir just until combined.

Pour the mixture into the prepared loaf pan and spread it out evenly.

Sprinkle the top with the remaining 1 teaspoon sugar and bake until golden brown on top and a toothpick inserted into the center comes out clean.

Begin checking for doneness at 40 minutes.

Cool in the pan on a wire rack for 10 minutes. Remove to the rack to cool completely.

Slice with a serrated knife and serve with jam.