Cake:
- 1 cup unsalted butter, softened
- 1⅔ cups granulated sugar
- 1 (3-ounce) box strawberry gelatin
- 3 large eggs
- 2½ cups all-purpose flour
- ½ teaspoon baking powder
- ½ teaspoon baking soda
- ¼ teaspoon kosher salt
- 1 cup whole buttermilk
- ½ cup finely chopped fresh strawberries