1. Cook pasta according to package directions; drain.
2. Meanwhile, whisk together peanut butter and next 6 ingredients in a bowl until smooth.
3. Heat canola oil in a large nonstick skillet over medium-high heat. Add chiles and next 3 ingredients; sauté 3 minutes or until shrimp are cooked through.
4. Toss pasta with peanut sauce and cucumber, and top with shrimp mixture. Garnish, if desired.