In the meantime, in a medium saucepan over medium heat, add ¼ cup of oil once the saucepan is hot. Add the chopped onion and minced garlic, cook until onion is tender, stirring occasionally, around 5 minutes. Add the chopped bell pepper, stir and cook for another 5 minutes. Add the tomato paste and ground chicken. Mix well so the ingredients get combined, and cook for about 5 minutes. Once the chicken is almost cooked add the spinach and cook until the spinach has shrink in size and is tender, around 5-6 minutes. Add salt and pepper to taste. Turn off the heat.