Preheat oven to 350° F. Brush both sides of baguette rounds with olive oil and place on a baking sheet. Toast for 15 minutes or until the edges are crispy while the centers still have a little give.
Add butter to a medium-sized skillet on medium-high heat. When the butter just begins to brown, add Sweet Potato Ribbons. Cook, tossing periodically, for five minutes.
Add mushrooms and toss periodically for four minutes or until the the sweet potatoes and mushrooms are thoroughly cooked. Remove from heat and stir in salt and pepper.
Spread goat cheese on one side of each toasted round and top with the sweet potato and mushroom mixture. Serve warm.