Preheat Oven to 350 degrees, grease and flour three (8 inch) pans
In a medium size bowl whisk together the flour, baking powder and salt. Set aside
In another bowl combine the egg whites, champagne, vanilla, strawberry extract, and vegetable oil. Whisk until blended and set aside.
In the bowl of your mixer, cream the butter and sugar 3 to 5 minutes. When it is light and fluffy add approximately ⅓ of the dry ingredients and mix until blended. Then add ½ of the liquid ingredients mixing until blended. Continue alternating dry and wet ingredients. Begin and end with dry ingredients (3 additions of dry and 2 wet). *Makes 7 ½ cups of batter.
Pour into prepared pans and sprinkle finely chopped strawberries over the batter, trying to avoid clumping the strawberries together. Bake 25 to 30 minutes. The cake is done when a toothpick inserted the center comes out clean. Cool in baking pans 10 min. then turn out.
For the Champagne Simple Syrup
In a small saucepan add the sugar and champagne. Over medium heat, cook until the sugar dissolves, stirring constantly until the mixture is clear.
Remove from the heat and cool completely before using. It can be stored in the refrigerator approximately 2 weeks.
Use sparingly on your cake layers. Using a toothpick or skewer, make a few holes on the top of each cake layer. Remember that using too much syrup can cause the cake to become soggy. Using a pastry brush, brush the simple syrup on top of each cake layer. Now you are ready to fill and frost your cake.