Prep. Preheat your oven to 350°F (177ºC) and line 2 baking sheets with parchment paper. Set aside.
Whisk Dry. In a large bowl, whisk together the flour (2 1/2 cups), cocoa powder (1/2 cup), baking soda (1 teaspoon), instant coffee (1 teaspoon), and salt (1/4 teaspoon). Toss in the chocolate chips (1 1/2 cups) to coat, then set aside.
Mix wet. In a separate bowl, use a handheld electric mixer to beat together the granulated sugar (1 1/2 cups) and melted, cooled butter (1 cup) until smooth and glossy. Beat in the eggs (2), vanilla extract (1 teaspoon), and peppermint extract (1/4 teaspoon) until fully combined.
Combine. Add the wet ingredients to the dry ingredients and mix just until combined. (The batter will be very thick.)
Scoop. Using a 1 1⁄2 tablespoons cookie scoop, scoop the batter and roll into balls, then arrange on the parchment-lined baking sheets. Refrigerate the dough balls right on the cookie sheets for 60 minutes. Bake: Bake the cookies for 7-9 minutes until the edges are set but the center is still slightly soft. You don't want to overbake these cookies.
Cool: Let the cookies cool on the baking tray undisturbed for 5 minutes before transferring to a wire cooling rack to cool completely.
Melt: In a microwave-safe container with a wide mouth, microwave the white chocolate chips (or baking chips) (2 cups) in 20-second increments, stirring each time.
Decorate: Dip half of each cookie into the white chocolate and sprinkle with additional crushed peppermint candies (1/2 cup).
Allow the chocolate to set before serving.