Preheat oven to 350°F (175°C); grease loaf pan.
Mix gluten-free flour, baking powder, and salt.
Cream the butter and sugar together until the mixture is light and fluffy.
Add the eggs one at a time, followed by the vanilla excerpt.
Alternate adding flour mix and milk, avoid overmixing.
Pour batter into pan; bake for 60-70 minutes.
Cool in a pan, then on a wire rack before serving.