Roast red pepper in a preheated 450º F oven by cutting in half and placing cut side down on a parchment-covered oven proof dish.
Cook for around 20-25 minutes until wrinkled and charred.
Remove from oven and cover with a clean kitchen towel or an upside down mixing bowl or place the peppers in a paper bag. The peppers will steam as they cool down which will loosen the skin.
Remove the skin, membranes and seeds. Set aside.*You can save the remaining roasted pepper in the fridge or freezer for your next batch of queso! Add all the ingredients into a high-speed blender except for the salsa and hot pepper flakes. Blend until smooth.
INGREDIENT SUBS Sub any acid for the jalapeno juice (lemon juice, apple cider vinegar, etc).Sub 1-2 tsp smoked paprika for chili in adobo (or any smoky spice or sauce you have on hand). *If you do not have a high-speed blender, soak the cashews for a couple hours, drain and rinse. Then follow the rest of the recipe.
Pour blender ingredients into a saucepan and heat over medium heat - stirring constantly until thickened (4 or 5 minutes).
Remove from heat and stir in the salsa or green chillies and hot pepper flakes (if using). Voila!