Yellow cake, really. You could turn this into a poke cake by pouring a lemon and sugar syrup over it when finished.
From the box of A.D. from Lutz, Florida, by way of Pennsylvania in the 1940s, and originating in Ohio in the 1920s.
2 egg yolks
3 Tbsp. melted butter
1 cup sugar
2 tsp. baking power
2 cups flour
Place eggs in cup, then fill cup with sweet milk. Place in mixing bowl and beat. Add butter and dry ingredients. Beat 5 minutes. Bake in layers.