Preheat oven to 350℉.
Butter and flour a 9-inch cake pan. (Or use cooking spray). A spring form cake pan makes it easy to release the cake when done.
In a small saucepan over medium heat, melt butter. Then add milk and heat until it starts to simmer. Remove from heat.
Meanwhile, in a medium bowl, beat together the eggs and sugar with an electric whisk until light and fluffy. Then, mix in vanilla.
In another bowl, combine the flour, almond flour, baking powder, and salt.
Fold the butter-milk mixture into the egg-sugar mixture. Then stir in the flour mixture, mixing just to combine.
Pour the batter into the prepare cake pan and bake for 28-35 minutes. The cake is done when lightly browned, pulling away from the edges, and a toothpick inserted into the middle comes out clean.
Let the cake cool a bit and then transfer to a plate or simply remove sides if using a spring-form. Top with powdered sugar if desired before serving. Enjoy!