Heat a skillet (or use the saute/roast function on your slow cooker) and add the oil. Sauté the onion for about 5-6 minutes, followed by the garlic and the pepper. Cook for about 4 more minutes,
Put the contents in the slow cooker if you have been using a skillet, or simply congratulate yourself on having a multifunction slow cooker, and switch it over from the saute/roast function to the slow cooking function and turn it to low.
Add the sweet potatoes, fire roasted tomatoes, aduki beans, salsa, stock or water. Cook for about 4 hours on low.
About 15 minutes before you are ready to serve, add the frozen crumbles, and stir them in well. Add a little more salsa or stock if you think it's cooked down too much. Cook the crumbles on high for about 10 -12 minutes, while you chop the cilantro or parsley and chives and set the table.
Taste and adjust seasonings, and sprinkle on the chopped herbs.