Preheat the oven to 350° F.
Prepare 4, 8-inch round cake pans with parchment paper circles and cooking spray. Put the strawberries in a blender or food processor and blend until the strawberries are pureed. Set aside.
In a medium mixing bowl, combine the flour, baking powder, salt, and strawberry jello powder with a whisk. Set aside.
In a separate large mixing bowl, beat the butter, oil, and sugar until smooth and fluffy. Add the eggs, vanilla extract, and strawberry puree. Mix until combined.
Add the dry mixture, alternating with the milk until completely combined.
Divide the batter evenly into the 4 cake pans.
Bake for 20-25 minutes or until a toothpick can be inserted and come out clean.
Allow the cakes to completely cool while making the frosting.