Place a wok or wide saute pan over high heat until hot. Add the oil, swirling to coat the sides. Add the garlic and cook until fragrant, about 10 seconds. Add the chicken, asparagus, bell pepper and cook, stirring constantly until the chicken is no longer pink, about 2 minutes. Add the sauce and bring to boil. Add the cornstarch solution and cook, stirring, until sauce thickens, about 1 minute. Remove pan from heat and stir in chili, basil leaves and cashews.