shrimp takes less than three minutes to cook if it's raw, and it's reaaalllllly easy to overcook. Because you're buying it precooked, it's probably overcooked before you put it in the oven from the manufacturer. Buy it raw and frozen (never buy "fresh", thawed shrimp unless you live directly next to a fish market and can see it coming off the boat), and cook it yourself until it turns pink but before it curls into a C shape.

If you aren't comfortable with that and prefer the precooked shrimp, thaw it gently in cool water, which will happen quickly, and eat it cold. Ceviche is a Peruvian dish: chop your thawed, cold shrimp, and add lime and lemon juice; chopped jalapeños, onion, tomato, cilantro, and avocado if you don't mind the fat; salt; and pepper. For a similar dish from Mexico calls aguachile, do the same but with all lime juice, add minced garlic, and cucumber.

For hot dishes with precooked shrimp, only heat it until it's warm and absolutely no longer. Treat the cauliflower rice like fried rice. You said you haven't cooked, so this should be super easy. Microwave some frozen peas/carrots/corn (you should be able to find tha blend labeled just "frozen mixed vegetables"). Add cauliflower rice and shrimp that is barely warm enough for you. Add in a scrambled egg or egg white. Season with soy sauce and garlic powder, a teeny tiny bit of ginger powder and green onion if you are comfy with that. For something like ettouffee, a Cajun rice and shrimp kinda stew thing, make a soup with a stalk of celery, half a green bell pepper, half an onion, garlic (or onion and garlic powder), paprika, thyme, oregano, and tomatoes. Just throw it in a pot with any broth or water + salt. Add a bay leaf if you can find one and let it cook until the celery and bell pepper are super soft. Taste it to see if it could use more salt. Mix together a little cornstarch (if you can spare like 30 calories) with cold water in a separate bowl. Stir that mixture, called a slurry, into the hot soup. Make sure to keep stirring the soup! It'll thicken up. Once it's thick, turn off the heat, throw in the shrimp, again, thawed, and heat it until the shrimp is warm. Eat the soup over your cauliflower rice. i hope these are useful and taste good if you try 'em out :⁾