Combine plant butter, garlic, salt, parsley and crushed chili flakes in a bowl. Mix well.
Coat frozen shrimp in garlic butter mixture, then place onto a lined baking sheet under the broiler for about 10 minutes, or until the shrimp is hot all the way through. Set aside.
Carefully open the bao using a sharp knife and your fingers. Insert one slice of OMNI, ½ slice of pineapple, 1 garlic shrimp, then drizzle with a tablespoon or two of teriyaki and top with green onion. Serve immediately.