Orange Muffins with Poppy Seeds

plus 2 tablespoons granulated sugar

large oranges

white whole wheat flour (or substitute whole wheat pastry flour or all-purpose flour)

poppy seeds

baking soda

kosher salt

large eggs, at room temperature

nonfat plain Greek yogurt, at room temperature

nonfat milk, at room temperature

unsalted butter, melted and cooled (or substitute melted, cooled coconut oil, canola oil, or very light olive oil)

pure vanilla extract

pure almond extract

butter, softened

powdered sugar

pure vanilla extract

orange juice (reserved from the oranges above)