If you have the time and remember, cut the bread you are using into cubes and let it sit out on trays on the kitchen counter overnight to get stale. If you don't do this, you can easily toast the bread in the oven. Preheat the oven to 300 degrees F. Spread the cubes onto baking sheets. Bake for 15 to 20 minutes until golden brown and toasted but not rock hard.
Increase the oven to 350 degrees F. If you have silicone muffin trays or silicone liners, use those. If not, use paper liners and generously grease with butter or nonstick cooking spray. You will need two muffin trays. Alternatively, you can bake the muffins in two batches if you only have one tray.
Prepare the stuffing mixture. Warm the butter in a large skillet over medium heat. Add the onion, celery, mushrooms, and apple. Cook for 10 to 13 minutes until tender. About halfway through the cooking time, stir in the garlic, sage, rosemary, thyme, salt, and pepper.
Remove the stuffing mixture from heat and transfer to a large mixing bowl. Stir in the dried cranberries.
In a separate bowl, whisk together the eggs, broth, and milk.
Pour the wet ingredients over the bowl with the rest of ingredients. Stir well to make sure all of the bread gets wet. Let the mixture sit for a few minutes so the bread softens.
Spoon the stuffing into the prepared muffin trays. It's helpful to push everything down into each muffin cavity with your fingers after filling them. This helps the muffins stay together. You want to fill each cavity all the way to the top but not overflowing.
Bake the muffins for 25 to 30 minutes until the tops are golden brown. If you are baking both trays at once, rotate the trays halfway through the cooking time to promote even baking.
Let the muffins cool for at least 20 minutes before taking them out of the trays. Ideally, they should finish cooling on racks after that. The muffins are delicate when warm, so it's helpful to let them finish cooling before transporting to storage containers. This helps prevent them from falling apart.
Enjoy right away or see notes for storage and reheating.
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