This recipe is FABULOUS! Original muffins: My gluten-free version:   2 cups GLUTEN-FREE flour 3/4 cup granulated sugar 3/4 teaspoon baking soda 1/2 teaspoon table salt 3 very ripe bananas, soft, darkly speckled, mashed well (about 1 1/2 cups) 1/4 cup plain yogurt 2 large eggs, beaten lightly 6 tablespoons unsalted butter, melted and cooled…