Make the Muffins
Position a rack in the center of the oven and heat the oven to 400°F. Liberally spray two 12-cup muffin pans with the cooking spray.
In a medium bowl, mix the all-purpose flour, cake flour, baking soda, baking powder, and salt; set aside.
In a large, clean mixing bowl, beat the egg whites and cream of tartar with an electric hand mixer on medium-high speed to firm (but not dry) peaks, 2 to 3 minutes. Set aside.
In another large bowl, beat the egg yolks with the mixer on medium-high speed until thick, ribbony, and lemon-yellow, about 6 minutes. Add the melted butter, sugar, and vanilla; mix on medium-low speed until combined, about 30 seconds. Add one-third of the dry ingredients and mix on low speed. Add one-third of the buttermilk and mix to combine. Alternate adding the remaining dry ingredients and buttermilk, ending with the buttermilk and mixing until just combined.
With a large rubber spatula, gently fold the whites into the batter, leaving some streaks.
Scoop about 1/2 cup of the batter into each muffin cup—you can fill the cups to the rims. Bake, rotating the pans after 10 minutes, until browned on top and puffed, and a toothpick inserted in the centers comes out dry, 20 to 25 minutes total.
Make the syrup
While the muffins are baking, bring the maple syrup to a boil in a small pot over medium-high heat. Put the strawberries in a medium serving bowl. Pour the syrup over the berries and set aside in a warm spot.
With an offset spatula, pop the muffins out of the cups and arrange on a platter. Sprinkle with confectioners’ sugar and serve with the syrup.
Make Ahead Tips
You can make the batter up to 2 hours ahead through the step of folding in the beaten egg whites. Refrigerate it, covered, in its bowl. Do not portion it into muffin tins until you're ready to bake.
Freeze any leftover muffins in a zip-top freezer bag for up to 2 weeks.
nutrition information (per serving):
9, Fat Calories
80, Saturated Fat
9, Monounsaturated Fat
56, Polyunsaturated Fat
Photo: Pernille Pedersen