Combine almond flour, oat flour, cocoa powder, baking powder, and sea salt in a bowl.
In another bowl, whisk together egg, coconut sugar, milk, coconut oil, and vanilla extract until smooth.
Mix wet ingredients into dry ingredients, then fold in chocolate chips.
Freeze the mixture for 20 minutes until firm.
Preheat oven to 350°F and line a baking sheet with parchment paper.
Form dough into a rectangle on the baking sheet and bake for 20 minutes.
Cool for 10 minutes, then slice into biscotti shapes.
Bake again for 8 minutes on each side until golden and crisp.
Let cool completely on a wire rack.
Melt dark chocolate with coconut oil, then dip half of each biscotti into the chocolate.
Drizzle melted white chocolate over the biscotti.
Refrigerate for 20 minutes to set the chocolate.
Serve and enjoy your homemade biscotti with your morning coffee!