Step 1

Preheat oven to 400 degrees. Spray a baking sheet with nonstick spray.

Step 2

Place mushroom caps on the baking sheet, rounded sides down. Bake until slightly tender, about 8 minutes.

Step 3

Remove sheet, but leave oven on. Blot away excess moisture from mushroom caps.

Step 4

Bring a medium pot sprayed with nonstick spray to medium-high heat. Add onion, celery, and mushroom stems. Cook and stir until slightly softened and lightly browned, 6 - 8 minutes.

Step 5

Transfer cooked veggies to a bowl.

Step 6

Add butter and 1 1/2 cups water to the (empty) pot, and bring to a boil. Once water boils, remove from heat. Add stuffing mix, cooked veggies, and dried cranberries. Mix until water has absorbed.

Step 7

Distribute stuffing mixture among the mushroom caps. Bake until slightly crisp on top, about 12 minutes. Serve 'em up!