Preheat oven to 350°F. Grease a donut pan with non-stick spray and set aside.

In a medium bowl whisk together the flour, baking powder, baking soda, nutmeg, salt and sugar together. Set aside.

Whisk the milk, yogurt, and egg together until combined. Add the melted butter and vanilla and whisk until combined. Pour the wet ingredients into the dry ingredients and stir with a spatula until just combined.

Transfer the mixture to a plastic zip-top bag and cut a corner off the bottom of the bag. Pipe the batter into the donut molds, filling each one about 3/4 full.

Add 1/4 cup of melted butter to a shallow bowl large enough to fit a donut. In a separate bowl of the same size, add the sugar and cinnamon and stir to combine. Lightly dip each donut in the melted butter, coating all sides. Dip in the cinnamon sugar immediately afterward, tossing until evenly coated.

Slice each donut in half horizontally. Spoon or pipe whipped cream on the bottom half of each donut. Top with sliced strawberries followed by the top half of the donut.