Preheat the oven to 350°F. Line a cupcake tin with cupcake liners. Set aside
In a small bowl, mix together the flour, cornstarch, cocoa powder, and salt together. Set aside.
In a stand mixer, beat together the butter, oil, and sugar together until light and fluffy.
Beat in the eggs one at a time, beating well after adding each egg.
Beat in the vanilla and the black food color. Add more black food color as needed. The mixture should look mostly very dark…