Preheat your oven to 350° and grease a 9 x 13 baking pan with butter.
In a large mixing bowl mix together your cake mix, eggs, oil, 1 cup of strawberries and your strawberry gelatin.
For your strawberry batter into your baking pan, bake for 30 minutes and let cool.
While your cake is cooling, make your frosting in a large mixing bowl by using a hand mixer to whip your butter.
Mash 1/2 cup strawberries and mix into your whipped butter with 1/2 tablespoon of vanilla extract.
Mix in your powdered sugar one cup at a time until you have the consistency you'd like.
Frost your cake with a spatula and place 9 strawberry halves onto the cake.
Enjoy!