In a large bowl, combine the flour, baking powder, baking soda and salt.
In a separate bowl, whisk the eggs and sugar until light and fluffy. Add the oil, yogurt, lemon zest and vanilla.
Mash the banana and add to wet mixture.
Blend the spinach leaves in a food processor until very finely chopped. Add to the wet mixture and mix to combine everything well.
Add the wet mixture to the dry and stir until just combined. Don’t over mix.
Spray a large mini muffin tin with cooking spray.
Spoon the batter into each cup, filling them nearly all the way to the top.
Bake at 350 for 15-20 minutes, until a toothpick inserted into the center comes out clean.
Remove from the muffin tin and let the muffins cool. Store in the fridge or freeze for later use. (See notes below.)
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Notes
Flour: I use white wheat flour to make these whole grain, but you can also use whole wheat flour, all-purpose flour or a combination of those two.Sugar: You can reduce this to ⅓ cup or use a full ½ cup depending on how sweet you want them. I've also made a naturally sweetened version of these using honey in place of the sugar. You can replace the sugar with ⅓ cup of honey and then use just 2 tablespoons of oil, to balance the amount of liquids. Everything else is the same!Yogurt: You can use plain yogurt or plain Greek yogurt. A nonfat yogurt or a 2% or 5% yogurt are all fine.Bananas: Your bananas should be very ripe and soft for this recipe.Spinach: Be sure to use fresh raw spinach for this recipe NOT cooked or frozen spinach.Storing: Store these muffins at room temperature, in a bag or covered container, for 1-2 days. After that, I like to put them in the refrigerator. (I do this with any baked good that uses banana because I find it can start to turn if it sits out too long.) They’ll keep in the fridge for another 3 days at least.Freezing: You can freeze these mini muffins for up to 6 months. Place them in a freezer-safe ziptop bag (that’s labeled!). Thaw overnight in the refrigerator or pop a couple in the microwave, straight from the freezer, and heat for about 15-20 seconds to defrost and warm through.