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Preheat oven to 350°F (175°C). Line a muffin pan with cupcake liners.
In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, salt, and vanilla powder (if using vanilla powder).
In another bowl, whisk milk, oil, eggs, and vanilla extract (if using vanilla extract) until smooth.
Pour wet ingredients into dry ingredients. Whisk (or mix on low speed with a hand mixer) just until combined.
Fill liners about ¾ full. Bake for 18–22 minutes, or until a toothpick inserted in the center comes out clean.
Let rest in the pan for 5 minutes, then transfer to a cooling rack. Cool completely before storing or frosting. Bon appétit.