*Thawing the frozen veggies ahead of time makes blending even quicker. As for veggie swaps, I would keep the onions, peppers, and garlic in any blend, but you're welcome to swap the carrots and spinach for other vegetables. You can also use fresh vegetables to clean out your produce drawer. Just be careful to not over-fill the chili with the hidden veggie mixture. A 5.5-quart Dutch oven fits everything as-written but doesn't have much spare room.