Add oil to a skillet on medium-high heat. When hot, add the Brussels sprouts. Sauté for about 8-10 minutes, stirring fairly often, or until the Brussels sprouts are nicely browned and tender-crisp.
Reduce the heat to medium-low and stir in the butter and pecans. Cook for 2 minutes.
Stir in the maple syrup and cook for about a minute. Season with salt & pepper. Remove from the heat and serve immediately.