Set your oven to 450°F and grab two bowls—one for the shrimp and one for the veggies. Toss the shrimp with one packet of taco seasoning & more minced garlic if you desire, making sure every piece is well coated. Slice the bell peppers, & in the other bowl, do the same with the sliced bell peppers and cherry tomatoes.
Spread the seasoned bell peppers and cherry tomatoes on a baking sheet with a drizzle of olive oil. Place them in the preheated oven and let them roast for 7 minutes. Roasting at high heat caramelizes the veggies, bringing out their natural sweetness.
After the veggies have roasted for 7 minutes, switch the oven to broil. Spread the seasoned shrimp on a separate baking sheet with a drizzle of olive oil and place it in the oven alongside the veggies. Broil everything for 8 minutes, flipping the shrimp halfway through for even cooking. The high heat will create a slight char on the shrimp, intensifying the blackened flavor.
While the shrimp and veggies are in the oven, mash the avocados in a bowl until smooth. Stir in the diced Roma tomatoes, minced cilantro, garlic, lime juice, and salt. Mix well, adjusting the lime juice and salt to taste.
Spoon warm rice into bowls, then top with roasted veggies and blackened shrimp. Add a generous scoop of guacamole on the side. I like to add pickled onions and sriracha fro added flavor and color!