Directions:
1. Preheat the oven to 350°F and grease a 9-inch round cake pan.
2. In a medium bowl, whisk together the flour, cocoa powder, baking powder, baking soda, and salt.
3. In a separate large bowl, cream together the butter and sugar until light and fluffy.
4. Beat in the eggs one at a time, then mix in the ricotta cheese, milk, and vanilla extract.
5. Gradually add the dry ingredients to the wet ingredients and mix until just combined.
6. Fold in the chocolate chips.
7. Pour half of the batter into the prepared cake pan.
8. Add the cocoa powder to the remaining batter and stir until well combined.
9. Drop spoonfuls of the chocolate batter on top of the plain batter in the cake pan.
10. Use a knife to swirl the batters together to create a marble effect.
11. Bake for 35-40 minutes, or until a toothpick inserted into the center comes out clean.
12. Let the cake cool in the pan for 10 minutes before transferring to a wire rack to cool completely.
Prep Time: 15 minutes | Cooking Time: 35-40 minutes | Total Time: 1 hour | Servings: 8 slices
