Preheat the oven to 400 degrees.
Add the carrots and peppers to one mixing bowl, and the shrimp and pineapple to another.
In a small bowl, whisk together the garlic, brown sugar and teriyaki sauce.
Pour half of the sauce mixture in the bowl with the vegetables, and the other half into the bowl with the shrimp. Toss each to combine well.
Spread the carrots and peppers onto a parchment lined baking sheet, and bake for 10 minutes.
Remove the tray from the oven, and layer the shrimp and pineapple on it.
Bake for another 10 minutes.
Serve garnished with chopped green onion.