Preheat oven to 375°F (190°C). Generously butter a 12-cup muffin tin.
In a large skillet, heat the olive oil and butter over medium-high heat until melted.
Add celery and onions; sauté until softened and lightly caramelized.
Stir in apples, cranberries, sage, thyme, rosemary, cinnamon, nutmeg, salt, and pepper. Cook 1–2 minutes, until the apples begin to soften.
Remove from heat and fold in the parsley and stuffing cubes.
Pour in 2 cups warm chicken stock, stirring gently until the bread is moistened but not soggy. Add more stock as needed.
Divide the mixture evenly into the muffin cups, lightly pressing to shape.
Bake 10–15 minutes, or until golden brown and crisp on top.
Cool slightly before removing from the tin. Serve warm.