Preheat the oven to 325 degrees F. Grease and flour two 9 inch cake pans. We like to line the bottom of our cake pans with circles of parchment paper. *If you prefer three layer cakes, you can also use three 8 inch pans.
Next, separate your eggs, saving only the 6 egg whites for this recipe. Set them in a bowl to the side.
In a medium bowl, whisk the flour, baking powder, baking soda, and salt for 30 seconds and set aside.
Wet Ingredients: In another bowl or measuring cup, add the buttermilk, vegetable oil, and vanilla extract and strawberry extract, and cooled, reduced strawberries. Set aside.
In the bowl of your mixer, add the butter and cream cheese and mix at medium speed until smooth.
Gradually add the sugar and mix at medium speed for 2-3 minutes.
Mixing on low speed, add the 6 egg whites one at a time (it's fine to estimate as they are all in the same bowl), mixing to incorporate after each addition.
With the mixer on low speed, alternately add the flour mixture and the buttermilk/strawberry mixture, beginning and ending with the flour mixture (We did 3 additions of the dry mixture, 2 additions of wet). If you'd like to add pink coloring, you can do that at any time.
Mix the batter just until well combined- be careful not to over-mix. Gently stir in the ¾ cup of finely sliced strawberries. Divide the batter between the two prepared 9 inch pans.
Bake at 325 degrees F for 30-35 minutes or until a toothpick inserted into the center comes out clean or with just a few crumbs attached, adjust time as needed.) *Baking times may vary slightly. (If baking three 8 inch layers, start peeking in after 25 minutes).
Once done, remove from oven and let cool for 5-10 minutes in the pans on a wire rack before turning out.
This recipe makes 7 ½ cups of batter.