In a frying pan add a olive oil and the onion, stir it until it turns brown.
Then add the shrimp and stir at the end add the garlic powder and salt and pepper to taste.
For the avocado.
First you have to cut the avocado by the middle of them and throw away the pit.
Then fill the avocado with the shrimp and add the manchego cheese on the top of them and bake them for 10 minutes , until the cheese goes down and turns brown.