Start by bringing a pot of water to a boil on medium-high heat, then gently lower large eggs into the boiling water. Cook them for exactly 9.5 minutes to achieve perfectly hard-boiled eggs. Once done, transfer them immediately to an ice bath for 10 minutes to halt the cooking process and make peeling easier.

Once the eggs are cooled, carefully tap them on a hard surface to crack the shells, then peel each egg. Slice the eggs in half horizontally and gently scoop the yolks into a mixing bowl, avoiding any damage to the white halves. For stability, trim a small amount off the bottom of each egg white, ensuring they stand upright later.

In a skillet over medium heat, melt a tablespoon of butter and sauté one minced garlic clove for about 30 seconds until fragrant. Add in a cup of baby spinach and cook until wilted, stirring occasionally, which should take about 2-3 minutes. Remove the skillet from the heat and let the spinach cool before combining it with the yolks.

In the mixing bowl with the egg yolks, combine the cooled spinach, mayonnaise, mustard, lemon juice, smoked paprika, hot sauce, and a tablespoon of dehydrated potato flakes. Use a fork or electric mixer to blend the mixture until smooth and creamy. Chill the filling in the refrigerator for about 30 minutes to enhance the flavor and texture for your Deviled Egg Christmas Trees.

Once chilled, transfer the deviled egg filling into a piping bag fitted with a star tip. Carefully pipe the filling into each egg white half, shaping it into a festive tree form. Aim for a slightly larger base tapering off at the top, which will help create a whimsical holiday look for your Deviled Egg Christmas Trees.

For a joyful finishing touch, insert small diced pieces of red Fresno chili pepper into the piped filling as tree ornaments. Additionally, place a star-shaped cutout of yellow bell pepper on top of each egg to mimic the star atop a Christmas tree. This adds both color and charm to your festive appetizers.

To complete your beautiful Deviled Egg Christmas Trees, generously sprinkle freshly grated Parmesan cheese over each one, mimicking a snowy effect. Arrange them on a decorative platter and serve them immediately, ensuring they remain fresh and delightful at your holiday gatherings.