Preheat oven to 350°F.
In a small bowl, mix together 1 teaspoon cumin and 1 teaspoon oregano with a generous pinch of salt and black pepper. Cut each chicken breast in half crosswise. Sprinkle all chicken pieces with spice mixture.
Heat 1 teaspoon olive oil in a Dutch oven over medium heat, and toast the millet for 3-4 minutes, until fragrant and a shade darker. Pour the millet into a bowl, return the pot to the burner, and add 1 tablespoon olive oil. Brown the chicken on all sides in two batches, about 5-8 minutes per batch. Transfer chicken to a plate as done. Pour off all but 1 tablespoon of fat, and add onion, garlic and bell pepper to the pot. Saute 5-8 minutes, until softened and translucent.
Pour tomatoes, beer and chicken broth into the pot, and add the remaining 2 teaspoons of cumin and 2 teaspoons oregano along with the bay leaf, annatto and another pinch of salt and pepper. Bring to a boil, and nestle the chicken legs and thighs into the liquid. Cover, and transfer to the oven. Cook 10 minutes.
After the dark meat has cooked 10 minutes, take the pot out of the oven, uncover, and scrape in the millet. Stir well, and nestle the rest of the chicken into the liquid in as close to a single layer as you can get it. Cover, and cook another 30 minutes.
Remove the pot from the oven, and uncover. Scatter the frozen peas and olives on top, cover, and let rest for 10 minutes before serving.