Preheat the oven to 350˚. Butter a 3-quart baking dish. Bring the chicken broth and dried porcinis to a boil in a medium saucepan. Reduce the heat and simmer until the broth takes on a strong mushroom flavor, about 15 minutes. Strain the liquid through a fine-mesh sieve into a large liquid measuring cup or bowl. Chop the porcinis and set aside.
Meanwhile, melt 4 tablespoons butter in a large skillet over medium-high heat. Add the wild mushrooms and cook, undisturbed, until starting to brown, about 5 minutes. Continue to cook, stirring occasionally, until well browned and tender, 5 to 7 minutes. Season with salt and pepper and remove to a plate.
Add 6 tablespoons butter, the shallots, garlic and thyme to the skillet. Cook, stirring, until the shallots are tender and lightly browned, 4 to 5 minutes. Add the wild mushrooms, porcinis, reserved mushroom liquid, 1 teaspoon salt and a few grinds of pepper. Bring to a simmer, then remove from the heat.
Whisk the eggs with 2 tablespoons chives in a large bowl. Add the bread cubes and mushroom mixture and toss until evenly combined. Transfer to the prepared baking dish, dot with the remaining 2 tablespoons butter and cover with foil.
Bake the stuffing until hot, about 30 minutes. Uncover and bake until golden brown, about 20 minutes. Let cool at least 15 minutes before serving. Sprinkle with the remaining 2 tablespoons chives.