Preheat the oven to 350 F. In a large bowl, whisk together flour, sugar, cocoa powder, salt, and baking soda. Add in the melted butter, eggs, and vanilla extract and mix until smooth. Add in the red food coloring. Mix until it is fully red.
Place the pie crust into a greased 9-inch pie plate. Pour the brownie mixture into the pie crust. Bake for 25-30 minutes.