Add cornbread and baguette cubes and broth to sausage mixture. Stir to combine.
Mound stuffing in center of foil on sheet pan.
In small bowl, mix remaining 2 tablespoons of the butter, 1 tablespoon sage, 1/2 teaspoon thyme, 1 1/4 teaspoons salt and 1/4 teaspoon pepper. Rub the butter mixture all over turkey breast, and place breast on top of stuffing. Pull up all four sides of foil around stuffing and turkey breast and move to one side of pan. Place sweet potatoes on other half of pan.
Roast for 45 minutes. Check the sweet potatoes and remove them if they are tender, and loosely cover the breast with foil if it's browning too quickly. Continue to roast for another 15 to 45 minutes (depending on the size of the breast), until skin is crisp and golden brown and an instant-read thermometer inserted into the thickest part of the breast registers 160 degrees, and sweet potatoes (if they are still baking) are tender when pierced in center with fork. Remove pan from oven; transfer turkey breast to a cutting board. Move sweet potatoes to a serving plate and cover to keep warm. Return stuffing to the oven to brown the top. Let turkey stand 20 minutes before carving.
While turkey is cooking, prepare the praline sauce. In a small saucepan, cook 2 tablespoons butter over medium heat until melted. Continue to cook for 1 to 3 minutes or until butter is lightly browned, stirring occasionally. Add brown sugar, cream and pinch of salt and bring to boil. Cook for another 1 to 2 minutes, until thickened, and then stir in pecans. Remove from heat and set aside.
Just before the turkey comes out of the oven, in medium bowl, add Brussels sprouts, mushrooms, olive oil, 1/2 teaspoon of salt and 1/4 teaspoon pepper. Toss to coat. Arrange vegetables on other side of sheet pan, opposite stuffing (without the turkey, which has been transferred to a cutting board). Bake about 20 to 25 minutes, until the vegetables are browned and tender. Check the stuffing after 10 minutes and remove if the top has browned.