Prepare ingredients: peel, devein, and optionally remove tails from the shrimp; seed and dice the red bell pepper; slice the chorizo (remove casing first if present); slice the avocado and cut the lime into wedges.
Heat a large sauté pan over medium heat.
Add the Zatarain’s Black Beans & Rice mix, 2 1/2 cups water, frozen corn, and butter to the pan; stir, cover, and bring to a boil.
Reduce heat to low, cover, and simmer for 20 minutes until the rice is cooked and liquid is absorbed.
Stir in the shrimp, sliced chorizo, and diced red bell pepper; cover and simmer 5 minutes more, taking care not to overcook the shrimp.
Remove the pan from heat and fluff the rice with a fork.
Top the rice mixture with sliced avocado, pico de gallo, and crumbled queso fresco; serve with lime wedges.