Optional for serving: maple syrupbutter, honey, Greek yogurt, fresh fruit, peanut butter, or any other pancake topping you love
If you'd like to keep the pancakes warm between batches, preheat the oven to 200 degrees F.
Place the oats in the bottom of a blender. Process a few times to grind, then add the mashed banana, Greek yogurt, milk, eggs, honey, baking powder, cinnamon, salt, and nutmeg. (See notes to make this recipe in a food processor instead.) Blend on high speed, stopping to stir a few times as needed, until the batter is very smooth and well combined, about 2 minutes. Let sit 10 minutes.
Heat a griddle or skillet over medium low. Brush lightly with olive oil or melt a little butter in the pan. Pour 1/4 cup of batter onto the hot griddle into the shape of a heart and cook 3 minutes, until the edges look dry (bubbles may not form on top). Flip and continue to cook for 1 to 2 additional minutes. Repeat with the remaining batter, adding a little more oil to the pan between batches as needed. For perfectly shaped heart pancakes, coat the bottom edges and the insides of a heart-shaped cookie cutter with oil or cooking spray. Lay it on the griddle and pour the batter inside. Cook until the edges are dry, then remove the cookie cutters, flip, and continue cooking as directed. Keep the pancakes warm between batches in a 200 degree F oven, if desired. Serve warm with desired toppings.
To make this recipe in a food processor, grind the oats until they become a flour. In one bowl, combine the oat flour, baking powder, salt, cinnamon, and nutmeg. In a separate bowl, whisk together the banana, yogurt, milk, eggs, and honey. Gently stir the wet ingredients into the dry, then cook as directed.
To freeze, lay the pancakes in a single layer on a parchment-lined baking sheet, then place in the freezer. Once the pancakes are frozen, transfer them to a ziptop bag and store for up to 2 months. (Do not put unfrozen pancakes in a ziptop bag without first freezing them flat or they will turn into a big, hard pancake blob.) Reheat in the toaster, directly from frozen.
Leftover pancakes can be stored in the refrigerator for up to 2 days, then reheated in the toaster as mentioned above.