In a mixing bowl, whisk the eggs. Whisk in the maple syrup and applesauce, followed by the baking powder, vanilla, cinnamon, and salt. Finally, stir in the oil or butter, milk, and muesli.
Cover the bowl and refrigerate for a minimum of 4 hours and up to overnight. (It’s best not to transfer to a baking dish now as you will need to stir the mixture after it has soaked.)
When ready to bake, grease a 9-inch square baking dish or a baking pan with similar dimensions. Remove the bowl from the refrigerator and stir the mixture thoroughly. Transfer to the prepared baking dish, spreading out the mixture and dispersing the dried fruit as necessary.
Meanwhile, preheat the oven to 350 degrees F. Bake, uncovered, for 30 minutes (give or take a few depending on oven and proportions of selected baking dish) or until just set in the middle.
Cut into squares and serve as is or with milk, yogurt, fruit, and/or other favorite oatmeal toppings.