Combine lime juice, oil, garlic and spices in a large bowl. Add chicken and toss to coat. Marinate 15 minutes, or up to one day, covered in the refrigerator.
Cook chicken in large preheated skillet over medium-high heat 5-7 minutes, or until no longer pink; drain if necessary.
Place crust on baking sheet or pizza pan. Spread salsa over crust; top with chicken, cheese, bell pepper, black beans and red onion. Bake in preheated 400°F oven 15 minutes, or until cheese is melted. Sprinkle with green onions or cilantro. Serve with sour cream, if desired.
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