Preheat the oven to 350°F and spray a 9x13-inch baking pan with non-stick spray.
Beat 1 stick of room temperature butter with an electric mixer until smooth.
Add granulated sugar and beat until creamy. Add egg whites and egg, and beat until fluffy (about 2 minutes).
Mix in milk, jello powder, and vanilla extract until combined.
Whisk flour, baking powder, baking soda, and salt in a separate bowl, then add to the wet mixture and beat on low until combined.
Pour the batter into the prepared pan and bake for 20-25 minutes, until a toothpick comes out clean. Let cool for 1 hour.
For the frosting, beat 2 sticks of softened butter until creamy. Add heavy cream, vanilla, and salt, then gradually add powdered sugar and beat until fluffy.
Crush golden Oreos and dried strawberries, mix with melted butter, and sprinkle over the frosted cake. Enjoy!