Toss shrimp with salt, pepper, and cornstarch until evenly coated. Set aside.
In a small bowl, whisk together all sauce ingredients until smooth. Set aside.
Heat 1 tablespoon oil in a large skillet or wok over medium-high heat. Add peanuts and sauté until golden brown, about 2-3 minutes. Remove and set aside.
Add remaining 2 tablespoons oil to the same pan. Add shrimp and cook until opaque and cooked through, about 2-3 minutes per side. Remove shrimp and set aside.
In the same pan, add minced ginger, garlic, dried chiles, and scallions. Stir-fry for 30 seconds until fragrant.
Pour the sauce mixture into the pan and simmer until thickened, about 1-2 minutes.
Return cooked shrimp and toasted peanuts to the pan. Toss everything together to coat with sauce.
Serve immediately over steamed rice.