Preheat the oven to 350°F (175°C) and grease a cake pan.
In a bowl, cream the softened butter and sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Stir in the vanilla extract.
In another bowl, combine almond flour, all-purpose flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, alternating with milk.
Mix until just combined; do not overmix.
Pour the batter into the prepared cake pan and spread evenly.
Bake for 30 minutes or until a toothpick inserted in the center comes out clean.
Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.