Lettuce Wraps with Spicy Thai Chicken

Name: Lettuce Wraps with Spicy Thai Chicken
Ingredients: 4 teaspoons canola oil, divided; 3 medium shallots, minced; 1 small red bell pepper, thinly sliced; 4 cloves garlic, minced; 1 pound ground chicken; 2 thai or serrano chiles, minced; 1 tablespoon fish sauce; 2 teaspoons dark brown sugar; 2 teaspoons lower-sodium soy sauce; ¼ teaspoon freshly ground black pepper; 1 cup basil leaves; The juice of one fresh lime; 4 lime wedges; Lettuce leafs