Cut the chicken breast into bite-sized pieces.
Dice vegetables such as onion and bell pepper.
Crack eggs into a bowl, add salt and pepper, and whisk together.
Heat olive oil in a pan and stir-fry the chicken breast.
Add the vegetables and stir-fry together.
Pour the egg mixture over and cook on low heat.
Cover with a lid and cook until set.
Transfer the finished frittata to a plate.