Preheat your oven to 350°F (175°C). Grease your loaf pan with butter or cooking spray and line the bottom with parchment paper for easy removal.
In a medium bowl, whisk together the all-purpose flour, baking powder, and kosher salt. Set this mixture aside.
In a large mixing bowl, use an electric mixer to beat the unsalted butter and sugar together until light and fluffy, about 3-5 minutes. The mixture should be pale in color and creamy.
Add the whole milk ricotta cheese to the butter mixture and mix until well combined. Then, add the eggs one at a time, beating well after each addition. Stir in the vanilla extract and orange zest until evenly distributed.
Gradually add the flour mixture to the wet ingredients, mixing on low speed until just combined. Be careful not to overmix, as this can lead to a dense cake.
Gently fold in the mini chocolate chips that have been tossed in a pinch of flour. This helps prevent them from sinking to the bottom of the cake during baking.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake in the preheated oven for 55-65 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs. If the top starts to brown too quickly, tent it with aluminum foil for the last 15 minutes of baking.
Once baked, remove the cake from the oven and let it cool in the pan for 10 minutes. Then, transfer it to a cooling rack to cool completely. Before serving, dust the top with powdered sugar for an elegant finish.