Soak raw cashews and sun-dried tomatoes in hot water for at least 1 hour. Drain.
Meanwhile, boil sweet potatoes in saucepan until fork tender, about 10 minutes. Drain.
In a high-speed blender, process all of the ingredients – except the can of diced tomatoes with chilies - on high speed for 1-2 minutes, until very smooth.
Pour the queso and diced tomatoes with chilies into a sauce pan and heat over medium-low heat until heated, about 5 minutes. Add in hot sauce (if using); adjust seasonings to taste; and add a little plant milk as needed to achieve desired consistency.
Use immediately or pour into a jar or container.
Store in the refrigerator for up to 1 week.
Notes
This dip is delicious served warm and makes a great topping on nachos and seven layer dip.