Preheat oven to 180ºC (350ºF) and grease ad dust with flour a 20 cm (8-inch) Bundt pan.
In a mixing bowl or stand mixer, 160 g softened buttereat 160 g softened butter and 360 g granulated sugar together until creamy.
Add 150 g eggs (approx 3 eggs), one at a time, mixing well after each addition.
Pour in 120 g whole milk and 120 g coconut milk Stir to combine.
Sift together 300 g all-purpose flour, 90 g cornstarch, and 12 g baking powder (approx. 1 tablespoon), then gradually fold into the batter until smooth.
Transfer batter to the prepared Bundt pan and bake for 35-40 minutes, or until a toothpick inserted in the center comes out clean.
Let the cake cool slightly before removing it from the pan.