Pulse the cashews in a blender until a fine powder forms. You’re looking for a flour-like consistency. Be careful not to overmix, or you’ll end up with cashew butter. Remove the cashew powder and set aside.
To the same blender, add the almond milk, garlic, salt, lemon juice and mustard. Blend on high until smooth.
Pour the liquid into a 6-quart electric pressure cooker. Add the spinach, artichoke hearts, water chestnuts, and chicken. Stir until well combined.
Secure the lid, select the manual setting, and set it to high pressure for 15 minutes.
When the pressure cooker timer is done, quick release the pressure.
Uncover and remove the chicken to a cutting board. Chop into bite-sized pieces, shred, or leave whole.
To the pressure cooker, add the cashew powder, nutritional yeast, and mayonnaise. If the sauce seems dry, add an extra splash of almond milk. Taste and add additional salt or freshly ground pepper to taste.
Add back the chicken and stir. Serve the chicken, topped with the sauce.
*Nutritional yeast adds a cheesy flavor without containing any dairy. Find it on the bulk aisle of your natural foods store, or in the baking section. If you can't find or don't want to use it, feel free to omit.**Avocado mayonnaise is made with avocado oil and is usually free of canola and soy oil, which is why I recommend it over regular mayo. Veganaise is an egg-free, vegan alternative to mayo, and is a great choice if you're avoiding eggs or want to keep this dish completely plant-based.Stirring in a few tablespoons of mayonnaise or veganaise at the end of the cooking time adds an extra creamy layer that makes this dip taste almost identical to its dairy-laden counterpart. If you're not a fan of mayo, though, feel free to skip it.If you're feeding a large crowd, this recipe can be doubled or even tripped. You'll need to add additional time to the cooking process, so experiment with your slow cooker to find the perfect timing.Turn this into a min dish by adding 1-2 pounds of boneless, skinless chicken breast or thighs. You’ll just need to adjust the time up to allow the chicken to cook fully, usually 4-5 hours on high or 6-7 on low. Be sure to give it a stir once or twice to avoid burning around the edges.