Preheat the Oven. Preheat your oven to 390°F (200°C).
Melt Butter. Melt the butter and let it cool.
Mix Wet Ingredients. Combine egg, salt, vanilla extract, sugar, milk, and honey in a bowl; mix until smooth.
1 medium egg, 1/8 teaspoon salt, 1/2 teaspoon vanilla extract, 2 teaspoon milk, 1.5 oz sugar, 1 teaspoon honey
Add Dry Ingredients. Sift in flour, matcha powder, and baking powder; mix until fully incorporated.
1/4 teaspoon baking powder, 1 teaspoon matcha powder, 2 oz cake flour
Incorporate Butter. Add the cooled, melted butter to the batter and stir until smooth.
4 tablespoon butter
Prepare Pan. Grease the madeleine molds with butter; dust with flour if not using a non-stick pan.
Fill Molds. Pour the batter into the molds, filling them about 3/4 full.
Bake. Place the pan in the oven, reduce the temperature to 360°F (180°C), and bake for 9-10 minutes until the edges are golden brown and the tops set.
Cool. Let the madeleines cool in the pan for a few minutes before removing. Transfer to a cooling rack.
Prep for Shells. Wash and dry the pan. Place a pastry bag inside a cup, folding the top of the bag over the rim of the cup.