Start by browning your butter. Place butter in a heavy saucepan and heat over low-medium temperature. Swirl every couple of minutes. Continue to cook butter until it turns a light brown and smells nutty. Little browned bits will develop on the bottom, scrape them up, but leave them in the mixture. This process will take 10-15 minutes. Allow browned butter to cool to room temperature before continuing.
Preheat oven to 350 degrees. Line the bottom of 2 9-inch springform pans with parchment paper. Coat with cooking spray. Apply cake insulators.
Place cooled browned butter, included solid bits scraped off the bottom, in a stand mixer fitted with a paddle attachment or a large mixing bowl.
Add both brown and white sugars. Blend until a grainy mixture forms. Add vanilla, blend. Add eggs, one at a time, combining well.
Sift together baking powder, salt and flour.
Alternate adding dry ingredients and milk to cake better, combing fully after each addition.
Fold in toffee bits.
Equally divide cake batter between both cake pans.
Bake for 30 minutes, then loosely cover tops with aluminum foil and continue to bake for another 30 minutes or until cakes pass the toothpick test.
Remove and allow to cool on a baking rack for 10 minutes. Remove from cake pans to cooling rack and allow to sit for at least 30 minutes.
Salted Caramel Frosting:
In a large mixing bowl with an electric mixer or in the bowl of a stand mixer fitted with the paddle attachment, beat butter until pale and fluffy.
Add powdered sugar, blending well.
Add caramel sauce.
Since caramel sauce consistency can differ greatly, you might need to add a small amount of milk or powdered sugar until you get to a frosting texture. The linked version has salt built into the recipe, if the sauce you are using does not, you might need to add salt as well.
Place one round cake on serving tray, if you do not use pan insulators, you might need to cut off the top to make it level. Frost center with half of the salted caramel frosting. Top with second cake and frost the top. This is a "naked cake" so leave the sides free of frosting.
Garnish with whole pecans.
If you've tried this recipe, come back and let us know how it was!
Cake is best eaten within 48 hours of preparing. Keep in an airtight cake container.