Cook the noodles in a large pot of boiling water seasoned with Bumbu sauce until just al dente. Reserve ¼ cup of the noodles water in case you need to thin out the noodles sauce later.
While the pasta is cooking, heat the 1 tablespoon of vegetable oil in a large frying pan over medium heat. Add the garlic, prawns and chilli flakes. Cook for 3 minutes or until the prawns are pink and opaque. Pour over the soy sauce and the reserved water.
Drain the noodles and add into the pan with the prawns. Turn the heat back to high and toss the noodles in the sauce for 2 minutes. Serve.