Orange Lemon Poppy Seed Muffins 2 and 1/2 cups (315g) all-purpose flour 1/2 cup (100g) granulated sugar 1/4 cup (50g) light brown sugar 3 Tablespoons poppy seeds 2 teaspoons baking powder 1/4 teaspoon baking soda 1/2 teaspoon salt 1/2 cup (115g) salted butter, melted* juice and zest of 2 medium lemons* juice and zest of 1 orange* 2 large eggs 1/2 cup (120g) non-fat or low-fat Greek or regular yogurt 1 teaspoon vanilla extract coarse sugar, for sprinkling