Get the shrimp ready by thoroughly washing, cleaning, and carefully deveining them.
Put the butter in a frying pan and melt it over medium heat. Add in the chopped onion and minced garlic and sauté for few minutes.
Add the clean shrimps into the frying pan and allow to sauté for 3 minutes. Pour in the heavy cream, black pepper, and salt to taste. Finally, add the spinach and allow to simmer for about 5 to 6 minutes. Allow it to cook properly before removing from heat.
If you want extra tastiness, you can add parmesan cheese to the mix.