Combine chicken, beer, oregano and bay leaf in a saucepan and bring to a simmer. Cook, covered, until chicken is no longer pink inside, 15 to 20 minutes. Let cool in liquid. Drain, discard bay leaf, and shred chicken (you should have about 2 cups).
Combine the chicken and Tomatillo Sauce. Season with salt and pepper.
Per serving: 72 calories; 2 g fat(0 g sat); 0 g fiber;
3 g carbohydrates; 9 g protein;
4 mcg folate; 23 mg cholesterol;
1 g sugars; g added sugars; 41 IU vitamin A;
3 mg vitamin C; 10 mg calcium; 0 mg iron;
93 mg sodium; 126 mg potassium