For the Salmon, mix all ingredients except salmon in small bowl. Place salmon in large resealable plastic bag or glass dish. Add marinade; turn to coat well. Refrigerate 15 minutes. Remove salmon from marinade. Discard any remaining marinade.
Grill salmon over medium-high heat 6 to 7 minutes per side or until fish flakes easily with a fork.
Meanwhile, for the Vegetables, mix maple syrup, soy sauce, vinegar, cornstarch, garlic powder and chipotle chili pepper in small bowl until smooth. Heat oil in large skillet on medium heat. Add onion and bell pepper; cook and stir 3 minutes. Stir maple syrup mixture. Add to skillet; stirring constantly, bring to boil and boil 1 minute. Remove from heat. Add spinach; toss gently just until spinach is wilted. Serve with Salmon.