Preheat your oven to 350°F. Lightly grease a 9×13-inch baking dish to prevent sticking.
Mix the Wet Base
In a large mixing bowl, whisk together the melted butter and sugar until smooth and fully combined.
Add the Eggs
Crack in the eggs one at a time, mixing well after each addition. This helps create a smooth, cohesive batter.
Incorporate Vanilla
Stir in the vanilla extract for added depth of flavor.
Add Dry Ingredients
Sprinkle in the mochiko flour and baking powder. Mix until the batter is mostly combined—it may look slightly lumpy at this stage.
Pour in the Milk
Gradually stir in the evaporated milk, followed by the coconut milk. Continue mixing until the batter is completely smooth and lump-free.
Bake
Pour the batter evenly into the prepared pan. Bake for about 1 hour, or until the top is golden brown and set.
Cool and Slice
Remove from the oven and allow the butter mochi to cool completely to room temperature. Once cooled, transfer to a cutting board and slice into squares.
Notes
Flavor Variations to TryOne of the best things about this Butter Mochi recipe is how easy it is to customize. Here are a few popular variations:Green Tea (Matcha) Butter Mochi: Add 1–2 tablespoons of matcha powder to the batter for a subtle earthy flavor and beautiful green color.Chocolate Butter Mochi: Mix in chocolate chips or swirl melted chocolate into the batter before baking.Ube Butter Mochi: Incorporate ube extract or mashed ube for a vibrant purple hue and sweet, nutty flavor.