Place the spring mix in a bowl with cucumber and tomatoes on top. Use a vegetable peeler to shave the carrot onto the top of the salad.
Whisk together the ingredients for the vinaigrette, then set aside.
Bring a pot of water to a boil over high heat. Add spaghetti and cook according to package directions. Drain the pasta.
Meanwhile, heat oil in a large skillet over medium heat. Saute the chicken until nicely golden brown on all sides. Add in the onion; cook, stirring, until softened, about 3 minutes. Add garlic, crushed red pepper, salt and pepper; cook, stirring, for 1 minute. Stir in the marinara sauce, bring to a simmer, stirring occasionally, until hot. Toss the sauce with spaghetti. Sprinkle with parmesan.
Toast the bread. Spread with butter and evenly distribute the minced garlic.
Dress the salad.
Mix the sparkling water and lemon together. Serve over ice if desired.
Serve the pasta with bread, salad, and sprtizer.