3 teaspoons extra-virgin olive oil
1 medium onion, diced small
3/4 teaspoon ground cumin (optional)
3/4 pound ground chicken breast
1 can (15 ounces) lentils, rinsed and drained, or 2 cups cooked lentils
3 tablespoons fresh breadcrumbs
1 large egg, lightly beaten
1 tablespoon chopped fresh cilantro (optional)
1/2 teaspoon coarse salt
1/4 teaspoon ground pepper
4 English muffins, split and toasted
Toppings (optional), such as lettuce, tomato, and ketchup