Blueberry Muffin and Buttermilk Pancakes Cake

all-purpose flour

granulated sugar

baking powder

cinnamon

ground nutmeg

salt, optional and to taste

large egg

buttermilk

sour cream (thick, full-fat Greek yogurt may be substituted)

canola or vegetable oil

vanilla extract

frozen blueberries (don’t unthaw, add them to the batter frozen; see below about using fresh)

confectioners’ sugar, optional for dusting or see glaze suggestions below