Heat oil in a large skillet or wok over medium heat.
Add garlic and onion, and sauté until fragrant.
Add bell pepper and broccoli; stir-fry for about 3-4 minutes.
In a small bowl, whisk together broth, cornstarch, maple syrup, soy sauce, vinegar, sesame oil, and red pepper flakes.
Pour the sauce into the skillet and stir well to coat the veggies.
Add chickpeas and continue cooking for another 5 minutes, until sauce thickens and broccoli is tender.
Serve over rice and garnish with green onion and sesame seeds.