Turn slow cooker on high. Add oil, chili powder, smoked paprika, cumin, red pepper, ancho chili powder and black pepper. Allow oil and spices to heat while preparing other ingredients.
Once spices are fragrant, add the tomato sauce, diced tomatoes, corn, beans, diced bell pepper, and vegetable stock (Do NOT add the noodles at this time).
Cook on high for 4-5 hours or on low for 8-10 hours.
About 10 minutes before servings, turn slow cooker up to high (if not already on high). Add uncooked noodles and stir to combine. Cook until the noodles are tender, about 8-10 minutes.
To serve, top each bowl with a generous heap of cheddar shreds and other desired toppings.