Preheat oven to broil on high.
Heat up sausage in a large tall-sided oven proof skillet for approximately 2-3 minutes.
Add garlic, tomatoes, and poblano peppers to the skillet and cook until tomatoes start to look wilted, approximately 3 minutes.
Add orzo and stir until it is coated with the juices in the pan.
Add Cajun seasoning, stock concentrate, salt, and 4 1/4 cups water and bring to a boil.
Lower heat to a simmer and let cook for 10-12 minutes, stirring occasionally.
While sausage orzo mixture is simmering, combine parmesan and panko breadcrumbs in a small mixing bowl.
When orzo is cooked al dente, stir shredded mozzarella cheese into sausage orzo mixture and mix well.
Sprinkle panko mixture on top of sausage orzo.
Broil in oven until panko starts to brown, approximately 2-3 minutes. Be careful not to burn, it browns quickly!