Prep Apple: Peel and chop the apple into small chunks. Cook apple pieces in a skillet over low heat for 10 minutes until soft and reduced.
Season: Sprinkle a bit of salt, cinnamon, brown sugar, and add lemon juice if using. Stir well and adjust seasoning to taste. Remove from heat.
lemon juice
Prep Oats: Grind half the oats to a fine flour-like texture using a blender or spice grinder.
Preheat Oven: Preheat oven to 180°C (350°F).
Mix Dry Ingredients: Combine ground oats, whole oats, salt, baking powder, cinnamon, and brown sugar in a bowl.
½ cup rolled oats, ⅛ tsp salt, ¼ tsp cinnamon, ¼ tsp baking powder, 2 tsp brown sugar
Mix Wet Ingredients: Add milk, yogurt, and oil. Mix until smooth with no dry spots.
¼ cup milk of choice, 2 tbsp Greek yogurt, ½ tbsp oil
Add the Apple: Fold most of the cooled apple mixture into the batter, reserving some for topping.
½ apple
Prepare Baking Dish: Lightly grease ramekins with oil.
Fill: Pour batter into ramekins; top with reserved apple chunks.
Bake: Bake for 25 minutes. Test doneness with a toothpick; it should come out mostly clean.
Cool: Cool in the oven with the door slightly open for 5-10 minutes.
Serve: Serve warm or cold, or refrigerate for later.