Preheat the oven to 350 degrees F. Spray a 9x5 inch loaf pan with nonstick baking spray - I like to use the kind that has flour in it.
In a bowl, whisk together the flour, baking powder and salt.
In the bowl of your electric mixer, beat the butter, ricotta and sugar together until combined, being sure to scrape the bottom of the bowl a few times. Beat for about 5 minutes.
Beat in each egg 1 at a time. Beat in the vanilla extract and the orange zest. Beat the dry ingredients until just combined. Then stir in the chocolate chips with a spatula.
Spread the batter in the greased 9x5 inch pan. Bake for 45 to 50 minutes, or until a tester inserted in the center comes out clean. Cool for 30 minutes, then invert the pan and let the cake cool on a wire rack.
Dust the top with powdered sugar. Slice and serve!