This Sausage and Swiss Chard Strata is the perfect dish to serve for brunch or dinner. It's a hearty and flavorful dish that's sure to impress your family and friends. The combination of sweet Italian sausage, Swiss chard, and Gruyere cheese creates a delicious and satisfying meal. This strata is also a great make-ahead option, as it can be prepared the night before and baked the next day. Simply assemble the ingredients, let the strata sit overnight, and then pop it in the oven when you're ready to serve. The crusty baguette slices add a nice texture contrast to the dish, and the coarse mustard provides a subtle kick. Don't skip the step of letting the strata sit for 10 minutes before baking, as this helps ensure that the bread absorbs the egg mixture and results in a moist and tender dish. Overall, this sausage and Swiss chard strata is a delicious and comforting meal that's perfect for any occasion.