Preheat the oven to 375 degrees F.
Lightly coat a six cup muffin tin with cooking spray.
Brush the bottom of each muffin cup with a thin layer of butter.
Sprinkle a small amount of turbinado cane sugar into the bottom of each muffin cup.
Evenly distribute the pineapple chunks among the prepared muffin cups.
In a mixing bowl, whisk together the Greek yogurt, almond flour, turbinado cane sugar, eggs, and vanilla extract until smooth.
Divide the yogurt mixture evenly between the muffin cups, filling each nearly to the top.
Bake for 35-40 minutes or until the centers are set and the tops are lightly golden.
Allow the bites to cool for 5 to 10 minutes before carefully inverting the muffin tin onto a cooling rack or serving plate.
Serve warm or allow to cool completely. Wrap individually and freeze for a refreshing frozen yogurt snack.