In a bowl, add shrimp garlic powder, white pepper, onion powder, salt and pepper. Mix until evenly combined.
In a small bowl, ,mix together sauce ingredients and set aside.
Heat a large frying pan over medium-high heat and add olive oil. Add the shrimp and cook for 2 – 3 minutes on each side until golden brown and just cooked. Cook in batches if needed as to not over crowd pan.
Remove the shrimp from the pan, add the veggies, and about 3-4 tbsp of water. Cover with lid and let steam for about 10 minutes or until softened. Mix about half way through.
In the meantime, heat up udon noodles per package directions, drain, toss with a tsp of oil to avoid sticking, and set aside.
Once veggies are done, add back cooked shrimp, noodles, and sauce. Toss until evenly combined. Garnish with greens of scallions and sesame seeds.