This light and fluffy oat flour vanilla cake will become your go-to recipe for a beautifully simple single-layer cake that can be dressed up in all sorts of ways.
Grease a 9-inch springform or deep cake pan with butter and line it with a circle of parchment paper.
In a large bowl, beat the butter and sugar until light and fluffy. Add the eggs one at a time, beating well after each. Beat in the vanilla.
In a medium bowl, stir together the flour, baking powder, and salt.
Beat in about a quarter of the flour mixture to the butter mixture, then add a third of the milk and mix just until combined. Continue adding flour and milk, finishing with flour and stirring each time just until blended, scraping down the sides of the bowl with a rubber spatula.
Scrape the batter into the pan and smooth the top. Preheat the oven to 375°F and let the cake rest while the oven heats. Bake for 35-40 minutes, until golden and a tester comes out clean.
Cool the cake in the pan for 15 minutes then turn out onto a wire rack to cool completely.