Preheat the oven to 180 degrees Celsius. Then, grease your 9-inch round cake pans with a little butter. After that, set them aside.
Afterward, combine 300 grams of butter and vanilla bean paste inside a large mixing bowl. Then, whisk using an electric mixer. After that, beat until the butter mixture becomes lighter in color and fluffy. Next, make sure to add your eggs one at a time. Also, mix every after addition. Then, scrape the bowl's sides and bottom to incorporate the eggs using a rubber spatula.
6 eggs, 300 g of softened butter, 4 tsp of vanilla extract
Next, be sure to sift your baking powder and flour into your cake mixture. Also, add your milk, and fold in your sprinkles.
350 g of self-raising flour, 1 tsp of baking powder, 4 tbsp of milk, 150 g of colorful sprinkles of your choice
After that, be sure to divide your cake batter between two cake pans. Then, place it inside the oven. Afterward, bake for about 25 to 30 minutes. Likewise, you can bake it until the cakes cook thoroughly.
Once your cakes finish baking, allow them to cool for 15 minutes. Make sure to do this before transferring into a cooling wire rack.
Then, beat 150 grams of softened butter with half of your powdered sugar using an electric mixer. Ensure to do so till it becomes fluffy. After that, add your cream cheese and the other half of your powdered sugar. Be sure to beat until well combined. Also, add your vanilla bean paste and mix.
150 g of softened butter, 180 g of full-fat cream cheese, 450 g powdered sugar, 1 tbsp of vanilla bean paste
After that, if the cakes cool completely, cut their top part to even them out using a long serrated knife. Likewise, you can utilize a cake cutter. Then, add a layer of icing into one of the cakes. Make sure to spread it evenly using your offset spatula. And ensure to put the other cake layer on top of the icing. Also, press gently. Afterward, apply the remaining icing on your cake's sides and top to crumb coat. Finally, place it inside the refrigerator for 15 minutes to set.