Preheat your oven to 350°F and line a muffin tin with cupcake liners.
In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt.
Add the oil, eggs, vanilla, and milk. Mix until smooth—don’t overthink it, just stir until it looks even.
Slowly pour in the boiling water while mixing. The batter will be thin, and that’s exactly how it should be.
Fill each liner about two-thirds full and bake for 18–22 minutes, or until a toothpick comes out clean.
Cool before frosting—or if you’re like me, sneak one warm without any topping.