Step #2 Generously grease & lightly flour bottoms & sides of two 8-inch or 9-inch round pans, or spray with baking spray.
Step #3 In large bowl, oil, beat cake mix, water, egg whites & yogurt with electric mixer on lowish speed 30 seconds; beat on medium speed 2 mins (batter will be lumpy).
Step #4 Pour into pans.
Step #5 Bake 8-inch rounds 27 to 32 mins, 9-inch rounds 25 to 30 mins, or until toothpick inserted in center comes out clean.
Step #6 Cool 10 mins.
Step #7 Run knife around sides of pans to loosen cakes; remove this from pans to cooling rack.
Step #8 Cool completely, about 1 hr.
Step #9 Spread 1/3 c frosting over 1 cake layer to within 1/4 inch of edge.
Step #10 Cut about 10 strawberries into 1/4-inch slices; arrange on frosted layer.
Step #11 Top with second layer.
Step #12 Frost side & top of cake with remaining frosting.
Step #13 Cut remaining strawberries in half; arrange on top of cake.