using a stand mixer with the paddle attachment, cream the butter and sugar together until nice and fluffy, scraping down the bowl a couple times to make sure it is all mixed
with the mixer on low, add the eggs, then scrape down and mix on med to med high until mixture is homogeneous
on the lowest setting mix in half of the flour mixture, then pour in the berry mix and stir, scrape down and add the rest of the flour mixing just until incorporated
pull bowl off mixer and mix with spatula by hand making sure nothing is stuck to bottom of bowl, then pour into pans trying to make as even as possible
place in preheated oven and bake starting at 30 minutes until cakes are done in center and bounce back when pressed with your finger
place on a cooling rack and let cool completely before removing from pans
to remove, run a butter knife around the edge of pan and then turn out onto a cutting board or other surface
at this point you can wrap the cakes individually and freeze for later, if you are using right away put in the freezer for at least 30 minutes or until frosting is ready
before frosting, use your hand to wipe off extra crumbs around the edges
frost and decorated as desired and enjoy!