Banana Oatmeal Chocolate Chip Cookie Bars

INGREDIENTS

large egg

small/medium or 1 extra-large ripe bananas (about 1/2 heaping cup mashed banana)

1/2 cup

light brown sugar, packed

1/4 cup

granulated sugar

1/4 cup

unsalted butter, softened (1/2 of 1 stick)

2 tsp

vanilla extract

1 1/2 cups

old-fashioned whole rolled oats (not instant or quick-cook because they act more like flour and aren’t suitable here)

1 1/4 cups

all-purpose flour

1/2

to 1 teaspoon cinnamon, added to taste

1/2 tsp

baking soda

1/4 tsp

salt, or to taste

1 1/4 cups

semi-sweet chocolate chips, divided