35-Minute Banana Muffins

Name: 35-Minute Banana Muffins
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: American
Ingredients: 2 1/2 cups (320g) all-purpose flour; 1 tbsp (14.3g) baking Powder; 1 tsp (5g) baking soda; 1 tsp (5g) ground cinnamon; 1/2 tsp (2.5g) kosher salt; 1/3 cup (79ml) extra virgin olive oil ((or vegetable oil)); 1 cup (128g) white sugar; 1/2 cup (70g) packed brown sugar; 2 large eggs; 3/4 cup (177ml) 2% Milk; 2 tsp (10ml) vanilla extract; 1 cup (128g) overripe bananas (mashed); 1 cup (128g) chopped walnuts (divided) ((Optional))