Preheat your oven to 350°F. Grease a 12×8 inch metal pan and set it aside.
In a large bowl, mix together the melted butter, oil, granulated sugar, and brown sugar until well combined. Add vanilla and eggs, beating for 30 seconds until the batter lightens.
Sift in the flour, cocoa powder, and salt. Gently mix until just combined. Incorporate the red food dye evenly into the batter.
Bake for 25-30 minutes or until the center no longer jiggles. For fudgy brownies, avoid overbaking. If you prefer them cakey, bake for an additional 5-8 minutes. Allow the brownies to cool completely before frosting.