Brown Sugar Blueberry Banana Bread with Blueberry Butter

Bread

large egg

plain or vanilla Greek yogurt (sour cream may be substituted))

liquid-state coconut oil (canola or vegetable oil may be substituted)

cup light brown sugar, packed

cup dark brown sugar, packed

teaspoons vanilla extract

to 2 teaspoons cinnamon, or to taste

ground nutmeg, or to taste

to 1 1/4 cups mashed ripe bananas (about 2 large or 3 small/medium)

all-purpose flour

teaspoon baking powder

teaspoon baking soda

salt, optional and to taste

about 1 1/2 cups frozen blueberries (keep them frozen and don’t thaw; fresh may be substituted)

Blueberry Butter

unsalted butter (1 stick), very well softened

about 1/2 cup blueberries, fresh or frozen (if using frozen, make sure they’re well-drained)