Sourdough Banana Nut Muffins

butter 8 tablespoons butter

brown sugar 1 cup brown sugar

eggs2 eggs

bananas 3 bananas

cream3 tablespoons cream

vanilla extract1 teaspoon vanilla extract

sourdough starter discard )

flour2 cups flour

baking powder2 teaspoons baking powder

baking soda

sea salt1 teaspoon sea salt

walnuts 1 cup walnuts