1-First Step: Prep and preheat Preheat your oven to 350°F (177°C). Line a 12-cup standard muffin tin with paper liners or lightly grease the cups if you prefer no liners. Place a rack in the center of the oven for the most even heat. Remove the eggs and buttermilk from the fridge so they reach room temperature while you assemble the dry ingredients.

2-Second Step: Mix dry ingredients In a medium bowl, sift together 3/4 cup (94g) all-purpose flour and 1/2 cup (41g) unsweetened natural cocoa powder. Stir in 1 teaspoon espresso powder or instant espresso, 3/4 teaspoon baking powder, 1/2 teaspoon baking soda, and 1/4 teaspoon salt. Sifting helps remove lumps from the cocoa and ensures even distribution of leaveners, which means more consistent rise and texture.

3-Third Step: Combine wet ingredients In a large bowl, whisk together 2 large eggs (room temperature), 1/2 cup (100g) granulated sugar, and 1/2 cup (100g) packed light brown sugar until the mixture lightens slightly. Add 1/3 cup (80ml) vegetable or canola oil, 2 teaspoons pure vanilla extract, and 1/2 cup (120ml) buttermilk. Whisk until the wet ingredients are smooth and homogenous. Using oil rather than butter keeps the crumb moist for longer great for make-ahead cupcakes.

4-Fourth Step: Bring batter together Pour the dry ingredients into the wet mixture and fold them together with a rubber spatula or low-speed mixer. Mix only until combined; small streaks of flour are fine. Overmixing builds gluten and can make cupcakes tough. The batter should be slightly thick but pourable. If it looks very stiff, add a tablespoon of buttermilk to loosen it.

5-Fifth Step: Portion the batter Use a 1/4-cup scoop or a spoon to fill each cupcake liner about halfway. Aim for even scoops so baking time is consistent across the tray. Fill minis halfway and standard liners about halfway to two-thirds full. Tap the pan gently on the counter to release large air bubbles.

6-Sixth Step: Bake Bake standard cupcakes for 18 to 22 minutes at 350°F, rotate the pan once at the 12-minute mark if your oven heats unevenly. Minis will take 10 to 12 minutes. Use the toothpick test: a toothpick inserted into the center should come out clean or with a few moist crumbs. Avoid overbaking; it dries them out.

7-Final Step: Cool and finish Cool the cupcakes in the pan for 5 minutes before transferring them to a wire rack to cool completely. If you plan to frost, wait until they are fully cool to avoid melting the frosting. Decorate with sprinkles or your favorite frosting. For a simple option, dust with powdered sugar or spread a quick chocolate ganache. If you want to serve at room temperature after refrigeration, bring frosted cupcakes to room temp for best texture.