Pineapple Upside-Down Cake in a Mug

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2 tablespoons maple syrup or dark amber agave syrup

1 pineapple ring, well drained and patted dry 

1 maraschino cherry, stemmed and patted dry

3 tablespoons all-purpose flour

1 tablespoon sugar

1/2 teaspoon baking powder

Pinch kosher salt 

1 tablespoon plus 1 teaspoon milk

1 tablespoon plain Greek yogurt

1 1/2 teaspoons coconut oil, at room temperature

Whipped cream, for serving, optional