Preheat the oven to 200, line a baking sheet with parchment paper.

In a large bowl with an electric hand mixer or in the bowl of a stand mixer fitted with the whisk attachment whip egg whites on high speed until white and foamy.

Add in cream of tartar and half of the sugar. Continue whipping until egg whites begin to thicken and soft peaks form. The meringue batter should be thick and when the mixer is removed from the bowl it should stick to the whisk and hold it's shape.

Add in the remaining sugar and vanilla and continue whipping on high several minutes until stiff peaks form.

Add in a drop of food coloring and mix until well incorporated. Add more food coloring if until desired color is reached.

Place mixture in a piping bag fitted with a large star tip or closed star tip.

Pipe onto the prepared baking sheet in a circular motion lifting up as you pipe the meringue mixture to create the Christmas tree shape. Top with a star shaped sprinkle and add additional sprinkles to decorate the trees.

Place in oven and bake for 2 hours. When finished baking shut the oven off and open it slightly, leave the meringues in the oven while they cool. (about 1 hour)

Store in a dry place in an airtight container.