Day 1 — Fermentation Batter
- 392g (~1½ cups) very ripe bananas, mashed
- 210g (~¾ cup) active sourdough starter
- 84g (~6 tbsp) neutral oil (olive, avocado, or coconut)
- 168g (~⅔ cup) Greek yogurt
- 6g (~1½ tsp) vanilla extract
- 336g (~2¾ cups) King Arthur bread flour
- 17g (~2 tbsp) instant espresso powder
Day 2 — Add In
- 210g (~⅔ cup) maple syrup
- 3 large eggs (~140g)
- 8g (~2 tsp) baking powder · 4g (~¾ tsp) baking soda · 5g (~1 tsp) salt
- 4g (~1½ tsp) cinnamon
- 140g (~¾ cup) chocolate chips (optional)
Maple Mint Espresso Vanilla Glaze
- 80g (~¼ cup) maple syrup
- 5g (~1 tsp) espresso powder dissolved in 25g (~2 tbsp) hot water, cooled
- 25–30g (~1 cup loosely packed) fresh mint leaves
- 12g (~2 tsp) vanilla bean paste
Instructions
- Day 1 evening: Mix bananas, starter, oil, yogurt, and vanilla. Add flour and espresso powder, mix until just combined. Cover and ferment at room temp 8–12 hours overnight.
- Day 2: Preheat oven to 350°F (175°C). Grease pan with coconut oil.
- Whisk together maple syrup, eggs, baking powder, baking soda, salt, and cinnamon in a small bowl.
- Gently fold the maple mixture into the fermented batter until just combined. Do not overmix. Fold in chocolate chips.
- Bake 60–70 minutes until a toothpick comes out clean. Cool in pan 10 min, then transfer to a rack.
- Glaze: Blend all glaze ingredients until smooth. Pour over completely cooled loaf.