Cook Eggs: Place 6 large eggs in a pot, cover with water, bring to a boil, simmer for 9.5 minutes, and cool in an ice bath for 5 minutes.

Prepare Filling: Crack and peel the eggs, slice in half, remove yolks, and refrigerate the whites. Sauté sliced garlic in butter and add baby spinach until wilted, then cool.

Blend Ingredients: Combine cooled spinach mixture, egg yolks, mayo, mustard, lemon juice, smoked paprika, hot sauce, and potato flakes in a blender; blend until smooth.

Pipe Filling: Transfer filling to a piping bag fitted with a star tip and pipe into egg whites to create tree shapes.

Decorate Trees: Secure diced red Fresno chili as ornaments and place yellow bell pepper stars on top; grate Parmesan for a snowy effect.