For the cake, prepare yellow cake according to package directions (for 2 9-inch layer cake pans). Cool completely.
In a small saucepan, combine the flour with milk, whisking until lumps removed. Turn on medium heat and continue to whisk until mixture becomes thick, like a pudding.
Remove from heat and stir in vanilla. Cool completely.
In a mixing bowl, combine butter and sugar, beat until light and fluffy (about 4 minutes). Slowly add in the COOLED milk mixture, beating until combined. It may curdle slightly in the beginning, that's okay, keep beating until it becomes the texture of whipped cream!
Place first layer of cooled cake on a cake plate. Top it with ALL of the cream filling. Add the second layer of cake on top.
Sprinkle generously with powdered sugar. Slice and enjoy!
Did you make this recipe?
Please leave a comment on the blog or share a photo on Instagram