1. Preheat the oven to 400°F. 2. Arranged the bacon slices on one or two separate baking sheets. Bake until crispy, about 20 minutes. Line another baking sheet with paper towels and transfer for the bacon to the paper towels to drain. Chop crosswise and set aside. 3. Meanwhile, toss the brussels sprouts with olive oil, salt, and pepper. Arrange on a rimmed baking sheet cut sides down. Roast until browned and the edges are crisp, about 30 minutes, shaking the pan occasionally. Keep the oven on. 4. In a large sauté pan or skillet, melt the butter over medium heat. At the pecans, brown sugar, and garlic salt and cook, stirring frequently, until toasted, about five minutes. Remove from heat and set aside. 5. Transfer the brussels sprouts to a large serving bowl. Drizzle balsamic reduction over the top and sprinkle with the pecans and bacon.