Add egg whites and lemon juice to a clean mixing bowl. Beat with a mixer or with a stand mixer using a whisk attachment at medium speed until the egg whites are foamy.

Gradually add sugar, a tablespoon at a time, while mixing constantly with the mixer at medium-high speed. After all the sugar has been added mix the meringue at high speed for 1-2 minutes. Check if all the sugar is dissolved - rub a small amount of meringue between your fingers, you should not feel gritty (if it does feel gritty, just beat it a little bit longer, until it's smooth). The meringue should hold its shape (should form stiff peaks) and be stiff and glossy. The whole process of making meringue will take about 5-10 minutes.

Transfer meringue to a piping bag fitted with a large round tip (you can also use a disposable decorating bag or gallon-sized resealable plastic bag with a 1/2-inch hole cut in the bottom corner).

Pipe ghosts onto the parchment paper.

Attach candy eyes or miniature chocolate chips (if using). If not using candy eyes/choc chips, you can paint the eyes and mouth with a food coloring pen/melted chocolate after the meringue is baked.

Take the ghosts out of the oven and paint the eyes and mouths with a food coloring pen/melted chocolate (if not using candy eyes/miniature chocolate chips).

Enjoy!