Preheat your oven to 350°F (175°C). Line a standard cupcake pan with cupcake liners and set aside.
In a large mixing bowl, whisk together the cake flour, granulated sugar, baking powder, baking soda, and salt until well combined.
In another bowl, mix the buttermilk, milk, clear vanilla, vegetable oil, and egg whites until smooth.
Pour the wet ingredients into the dry ingredients and mix until just combined. Be careful not to overmix; a few lumps are okay!
Divide the batter evenly among the prepared cupcake liners, filling each about two-thirds full.
Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center comes out clean. Allow them to cool in the pan for a few minutes before transferring to a wire rack to cool completely.
In a large mixing bowl, combine the chilled mascarpone cheese, fresh orange zest, vanilla extract, and powdered sugar. Beat on medium speed until smooth and creamy.
In a separate bowl, beat the heavy whipping cream until stiff peaks form. Gently fold the whipped cream into the mascarpone mixture until fully combined.
Once the cupcakes are completely cooled, generously frost each with the mascarpone mixture. Top with mini chocolate chips for an extra touch of sweetness.