In a large skillet add in the canola oil and bring to a high heat. Next, add in the chicken and sauté on all sides until golden brown, about 5 minutes. Remove the chicken from the skillet.
Return the skillet to medium heat and add in the garlic and sauté until golden, about 1-2 minutes.
Next, add in the diced tomatoes and artichokes (with liquid), bring to a simmer and cook for 5 minutes, mixing occasionally.
Next, add in the spinach and cook for 2 minutes while mixing the spinach in. Finally, add the chicken back into the skillet and sauté for 5 minutes, mixing occasionally.