Place the chicken breasts, garlic, bay leaf, chicken bouillon, black peppercorns, and szechuan peppercorns in a small pot. Fill with water until the chicken is just covered. Place over medium-high heat and bring to a boil. Lower heat to low and allow the chicken to simmer for 10 to 15 minutes, until the chicken registers a temperature of 165°F. Remove the chicken from the water and set aside to cool.