Beat cake mix and next seven ingredients at low speed with a mixer for one minute.
Scrape down the sides and beat for two more minutes at medium speed, scraping the sides as necessary.
Pour batter into two or three greased cake pans.
Bake at 350 for 23 minutes or until center is springy when lightly pressed. Note - baking time may need to be adjusted, depending upon the number of layers.
Remove from pans and cool completely before frosting.
FOR THE FROSTING
Beat butter with a mixer at medium speed for 20 seconds or until fluffy.
Slowly add powdered sugar and optional strawberries, beating at low speed until creamy.
Add more sugar if too thin.
Notes
Keep refrigerated until ready to serve. Original recipe from Southern Living Magazine.