Assuming that your cake is three layers tall, the most basic birthday cake recipe includes 1 cup of butter at room temperature, 2 cups of sugar, 4 eggs, 3 cups of flour, 1 cup of milk and 1 teaspoon of vanilla extract. The icing and specifics are up to you.
This particular recipe makes basic cake material with unremarkable flavor, open to all sorts of alterations and flavorings. Preheat the oven to 350 degrees Fahrenheit, and use this time to grease and flour three 9-inch cake pans. Mix together all of the pre-listed ingredients, ideally with an electric beater, making sure to add the eggs one at a time. The ideal mixing procedure is butter, sugar, eggs, flour, milk and vanilla. This process takes about 10 minutes total.
Mix extremely well to avoid air bubbles in the batter and clumps of unmixed flour, which have a foul taste if left unattended and baked. Once the oven preheats, pan the mixture equally onto the three cake pans. Baking time takes anywhere from 25 to 30 minutes. When the cake is done, leave the layers in their pans and let them cool for about 10 minutes. It helps to stick a toothpick into the batter to see if it is still moist inside. If the cake is still moist, let it bake for a little while longer. Once they cool, invert the pans onto the cooling racks, and proceed to decorate the layers as much as you like.