Bring a large pot of water to a boil. Cook the pasta according to the directions on the package.
Before draining the pasta reserve 1 cup of the pasta water.
Heat a large nonstick skillet or wok over medium heat. Spray the pan with cooking spray and add the minced garlic. Saute until it becomes fragrant and slightly golden, about 1-2 minutes. Be careful not to burn the garlic or it will become bitter.
Add 1/4 cup of the green onions and 1/4 cup of the reserved pasta water. Cook for 3 minutes or until the green onions are softened.
Pour in the soy sauce, oyster sauce, Worcestershire sauce, sriracha, and 1/2 cup of the reserved pasta water.
Heat until the sauce simmers then add the spaghetti noodles. Toss to coat the pasta. If the pasta is somewhat dry add the remaining 1/4 cup of pasta water.
Garnish with remaining green onions and red pepper flakes.