• Preheat oven to 325℉.
• Grease a 13X9 inch oven safe baking dish with non-stick spray. Set aside while you prepare the cake batter.
• In a mixing bowl, whisk together the wet ingredients; buttermilk, eggs and yolk, vanilla paste, and 2 tablespoons melted butter. Set aside.
• Sift together flour, sugar, salt, baking powder, and baking soda and place in the bowl of a stand mixer.
• With mixer on low speed, add the two sicks of softened butter to the dry ingredients a tablespoon at a time until incorporated. Increase speed to medium and blend until the mixture resembles coarse sand.
• Add half the buttermilk/egg mixture and blend to incorporate. Add the second half and blend on medium speed just until incorporated. Scrape down the sides of the mixing bowl and blend together, about 10-15 seconds. Batter will look a little lumpy that's ok. Do not over-mix the batter or the cake texture will be tough.
• Pour the batter into the prepared cake pan.
• Bake for 45 minutes until edges are a light golden brown and a toothpick inserted in the center of the cake comes out mostly clean. A few crumbs on the tooth pick is fine.
• Remove cake from the oven and allow it to cool sightly for about 10-15 minutes while you prepare the glaze.

Make the glaze:

• Melt 1 stick of butter in a saucepan over medium heat. Once butter is completely melted, turn off heat. You can also melt the butter in the microwave instead of on the stovetop.
• Add the brown sugar, vanilla paste, and buttermilk to the melted butter. Whisk to combine.
• Once combined add the powdered sugar to the bowl and whisk vigorously until all the sugar is completely dissolved and you have a smooth glaze.
• Use a wooden skewer to poke holes all over the cake. Slowly pour the warm glaze onto the still warm cake. Use a rubber spatula to encourage the glaze to soak into the holes in the cake. Cover the entire surface of the cake with the glaze.
• Let the glaze set up for 45 minutes to an hour before cutting into the cake.
• Serve cake slightly warm or at room temperature with your favorite fresh berries and a generous dollop of freshly whipped cream or a scoop of ice cream if desired.