Heat a medium skillet over medium-high heat. Heat olive oil for about 30 seconds or until hot. Add onion, garlic, peppers, salt and pepper to taste, and thyme. Cook, stirring occasionally, for 5-7 minutes or until the onion is translucent. Add the kale and cook another 3-5 minutes. Crush the tomatoes by hand and pour into the veggie mixture. Heat to a simmer and reduce heat to medium-low. Taste and re-season with salt and pepper.