In another bowl mix the wet ingredients, egg, milk, vanilla, melted butter and syrup. Room temperature milk is best so that it doesn't combat with the warm melted butter, you can microwave for about 30 seconds if needed.
Remove from oven, gently spread a tablespoon of Greek yogurt on each pancake. Then pour a tablespoon of pancake batter over the Greek yogurt. Return to oven and bake an additional 6 minutes for pancakes or 8 minutes for mini muffins or doughnuts. The top of the pancakes, mini muffins and doughnuts will NOT turn a golden brown, so don't rely on the typical visual for pancakes. You can use a toothpick pricked in the pancake, if it comes out clean then the muffins or doughnuts are done.
To make the frozen Greek yogurt discs, spread 2 tablespoons of Greek yogurt on a parchment lined baking sheet, use the back of the spoon to make a 4" circle. Freeze for at least an hour.
This is a harder method than the muffin top pan but makes more traditional looking pancakes. Warm a skillet or griddle over medium heat. Remove 2-3 Greek Yogurt disks at a time from the freezer, if you take too many disks out they will start to melt and it's a mess to get them onto the pancake batter. Spoon 1/4 Cup batter (use a measuring cup for even size pancakes and to make sure that the size is appropriate for the frozen yogurt disk). Immediately lay down a frozen disc of Greek Yogurt and immediately pour another 1/4 Cup batter on top. If you wait too long the second layer of pancake will run over and outside of the bottom layer producing an uneven pancake and thin coverage for the yogurt. This makes it messier to carry when you are ready to eat and walk.
-Pancakes will keep for 5 days in the refrigerator. To freeze, place pancakes on a parchment lined baking sheet in a single layer and freeze, once frozen you can put the pancakes in a resealable bag marked with recipe name and date frozen. Reheat in microwave for 30 seconds and enjoy. Preferred method is to reheat in a 425 degree oven for about 10 minutes, take directly from the freezer.
-Option: Add chopped fresh fruit when adding the Greek yogurt on the pancake batter.
-If you are making the traditional pancakes and are short on time and can't wait for the Greek Yogurt to freeze into solid disks, then you can fill a resealable bag with the yogurt, snip a small hole on one of the bottom corners and squeeze onto the pancakes.