Preheat and Prep: Preheat your oven to 375°F (190°C). Line a 12-cup standard muffin tin with paper liners or grease well to prevent sticking.
Mix Wet Ingredients: In a large bowl, whisk together the sourdough discard, granulated sugar, brown sugar, melted butter, eggs, vanilla extract, and buttermilk until smooth and well-combined.
Combine Dry Ingredients: In a separate bowl, sift together the flour, Dutch-processed cocoa powder, espresso powder, baking powder, baking soda, and salt.
Prevent Chip Sinking: Toss the chocolate chips with 1 tbsp flour in a small bowl. This helps them stay suspended in the batter for even distribution.
Mix the Batter: Gently fold the dry ingredients into the wet ingredients until just combined. Avoid over-mixing to keep the muffins tender. Fold in the flour-coated chocolate chips.
Portion the Batter: Divide the batter evenly among the 12 muffin cups, filling each about 2/3 full (~1/4 cup batter per muffin) for standard muffins or 3/4 full for taller domes (may yield 10–11 muffins). Sprinkle a few extra chocolate chips on top for a bakery-style look.
Bake for Perfect Domes: Bake at 375°F (190°C) for 5 minutes to encourage a quick rise and domed tops. Without opening the oven door, reduce the temperature to 350°F (175°C) and bake for an additional 13–17 minutes (total time ~18–22 minutes). A toothpick inserted in the center should come out clean or with a few moist crumbs (avoid hitting chocolate chips). Tent with foil if tops brown too quickly.
Cool and Enjoy: Let the muffins cool in the tin for 5 minutes, then transfer to a wire rack to cool completely. Serve warm for melty chocolate goodness!
Notes
Prevent Sinking Chips: Tossing chips in flour ensures even distribution.
Domed Tops: The 375°F start creates tall, bakery-style muffins. Don’t skip the temperature reduction.
Substitutions: Use plain yogurt or sour cream instead of buttermilk. Regular cocoa powder works but is less intense.
Storage: Store in an airtight container at room temperature for 2 days, refrigerate for 5 days, or freeze for 3 months. Reheat for 10 seconds in the microwave.
Mini Muffins: For mini muffins, bake at 375°F for 3 minutes, then 350°F for 8–10 minutes (yields ~24–30).