Preheat the oven to 350°F. Grease a nonstick muffin pan with cooking spray. (If your pan is not nonstick, use paper liners.)
In a large bowl, whisk together the eggs, vegetable oil, melted butter, vanilla extract and water.
In a separate medium bowl, whisk together the sugar, flour, cocoa powder, confectioners’ sugar and salt. Add the dry ingredients to the wet ingredients and mix just until combined.
Fold in the chocolate chips then divide the batter among the muffin pan cupcakes, filling each 2/3 full.
Bake the brownie cupcakes until they are just set in the center and a toothpick inserted comes out with a few moist crumbs, 18 to 22 minutes. (Do not overtake the cupcakes, as they will continue cooking while they cool.) Remove the brownie cupcakes from the oven then let them coo in the pan for 10 minutes.
Using a knife or offset spatula, trace around the edges to release the cupcakes then serve topped with ice cream (optional).
★ Did you make this recipe? Don't forget to give it a star rating below!