Just Enough Powdered Sugar Donut Cake

1. Preheat oven to 350°F. Grease and line a 6-inch round cake pan with parchment paper.
2. Whisk flour, baking powder, and salt. Beat butter, oil, and sugar until light and fluffy. Add eggs one at a time, then vanilla. Mix in milk, followed by the dry ingredients until just combined.
3. Pour into the pan and bake for 45–55 minutes, checking around 45 minutes. A toothpick should come out clean or with a few moist crumbs. Cool completely.
4. Brush the melted butter generously over the top and sides of the cooled cake.
5. Immediately cover generously with powdered sugar, pressing it onto the sides so the entire cake is coated.