Preheat the oven to 350°F. Grease a mini muffin pan with cake goop by brushing it in the wells of the pan (see notes) and set aside.
Melt 1 cup unsalted butter in a heavy-bottomed saucepan over low heat. Add 2½ cups granulated sugar and stir until smooth, the butter and sugar have started emulsifying, and no butter is separated from the sugar. Remove from heat and let the mixture cool for 5 minutes, stirring often to release heat.
Add 2 tablespoons canola oil and 1 tablespoon vanilla extract to the butter and sugar and beat them in with a rubber spatula until fully combined and there's no separation between the ingredients (no oil resting on top).
Beat in 5 large eggs one at a time, beating with the spatula or a fork after each one. Mix until fully incorporated.
Sift the 1 cup all-purpose flour, ¾ cup + 1 tablespoon unsweetened cocoa powder, 2 tablespoons malted milk powder, and ¾ teaspoon salt into the butter and sugar mixture, stirring gently with a rubber spatula just until almost all the dry streaks are gone.
Fold in the ½ cup mini semi-sweet chocolate chips.
Divide the brownie batter evenly into the wells of the prepared baking pan (about 1½ tablespoons each) and bake for 14 to 16 minutes.
Cool before removing them from the pan. Use a paring knife to help pop them out.