Use eggs that peel easily: Eggs that have been in the fridge a few days usually peel more cleanly than very fresh eggs.
Cool the spinach mix: Let the garlic and spinach cool before blending so the filling stays thick and pipes neatly.
Level the egg bases: Trim a tiny slice from the bottom of each egg white so your mini Christmas trees stand upright on the platter.
Keep the filling covered: Press plastic wrap directly onto the surface of the filling if you make it ahead so it does not dry out. If the yolk mixture is runny, chill it for 20 minutes to firm it up and make it easier to pipe cleanly.
Pipe near serving time: Pipe the trees and add the peppers shortly before serving so the edges stay defined and the colors pop.
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