chocolate marble pound cake

this is from the food & wine year of recipes 2004 cookbook. it is easy and so yummy. i served this with sliced strawberries and a sprinkling of powdered sugar.

2 cups all-purpose flour (i used half whole wheat)
2 tsp baking powder
1/4 tsp salt
1 1/2 sticks unsalted butter, softened, plus 3 Tbs melted
2 Tbs unsweetened cocoa powder, preferably Dutch process
1 1/3 cups granulated sugar
2 large eggs
1 tsp pure vanilla extract
1/2 cup heavy cream or milk
confectioner's sugar, for dusting

1. preheat oven to 350. spray an 8 by 4 inch loaf pan with vegetable oil cooking spray and line it with parchment paper, spray the paper.
2. in a bowl, whisk the flour, baking powder and salt. in another bowl, combine the melted butter and cocoa until smooth.
3. in a food processor, combine the soft butter and granulated sugar. add the eggs and vanilla and process til smooth. add dry ingredients and pulse just until combined. add the cream and process til smooth. transfer 1 cup of batter to the bowl with cocoa and stir til smooth.
4. spoon half of the remaining batter into the pan and smooth the surface. spread the chocolate batter in the pan, then cover with the remaining plain batter. using a table knife, cut 5 swirls in the batter.
5. bake the pound cake for 25 minutes. reduce to 325 and bake for 25 min more. cover loosely with foil and bake for 15-20 min or until the cake is lightly browned and the center is done.
6. let the pound cake cook in the pan for 10 minutes, then unmold and let cool completely on a wire rack. dust with confectioners sugar before serving.