Heat a large nonstick skillet over medium-high heat.
Add 1 tablespoon oil to pan; swirl to coat.
Add poblano chiles and onion. Cook 5 minutes or until edges of vegetables are browned, stirring occasionally; add garlic last 1 minute of cook time.
Remove vegetables from pan; keep warm.
Heat 1 tablespoon oil in pan.
Add yellow squash and zucchini; cook 9 minutes or until edges are browned, stirring occasionally.
Stir in onion mixture, corn, and next 3 ingredients (through green chiles). Cook 3 minutes or until thoroughly heated, stirring frequently to deglaze pan.
Remove from heat; stir in green onions.
Sprinkle with cilantro, and serve with lime wedges.