Preheat the oven to 350F/177C convection (325F/163C conventional) and line 12 muffin tins.
In a medium bowl, whisk together the flour, baking powder, salt and cinnamon. Set aside.
1 1/4 cups (150g) all-purpose flour, 1/2 Tbsp (5g) baking powder, 1/4 tsp salt, 1/2 tsp cinnamon
In a large bowl, whisk together the sugar and egg until they’re smooth. Add the greek yogurt, oil and vanilla extract, whisking them until they’re completely combined.
3/4 cups (150g) granulated sugar, 1 large egg, 1/4 cup (56g) greek yogurt, 1/4 cup (59mL) vegetable oil, 1 tsp vanilla extract
Add the bananas to the mixture and mix until they’re fully combined. Then fold in the dry ingredients, just until the last streak of flour is incorporated. Mix in the chocolate chips, just until they are evenly distributed.
2 medium (175g or 3/4 cup) ripe bananas, 1 cup (6oz) milk chocolate chips
Pour the batter into the prepared tins, filling them 2/3-3/4 full, and bake for 21 minutes. Remove them from the oven and allow them to cool for at least 5-10 minutes before removing them from the pan to cool completely.