Preheat your oven to a gentle 225°F (107°C). Prepare a baking sheet by lining it with parchment paper or a silicone mat.
In a sparkling clean, dry mixing bowl (glass or metal works best!), add the room-temperature egg whites. Beat them with a whisk attachment (or hand mixer) until they form soft, airy peaks.
Sprinkle in the cream of tartar, then gradually add the monk fruit/erythritol blend while continuing to beat. Whip until the egg whites are glossy and form stiff, firm peaks that hold their shape.
Gently fold in the vanilla and coffee extracts, then slowly add the unsweetened cocoa powder. Mix carefully until everything is just combined and the batter has a beautiful mocha color.
Carefully transfer the meringue mixture into a piping bag fitted with your favorite tip (or use a zip-top bag with the corner snipped off). Pipe small, even dollops onto your prepared baking sheet. If you don't have a piping bag, simply spoon small mounds onto the sheet.
Bake for 90 minutes, or until the cookies feel firm and dry to the touch. Then, turn off the oven and leave the meringues inside for another 30 minutes to cool completely and crisp up beautifully. This step is key for that perfect crunchy texture!
(Optional) For an extra touch of decadence, melt the sugar-free chocolate chips and coconut oil together in a microwave-safe bowl for about 1 minute, stirring until smooth. Dip half of each cooled meringue cookie into the melted chocolate, letting any excess drip off. Place them on a wire rack to allow the chocolate to set and harden.