To bowl of high-powered blender, add sunflower seeds and boiling water and let sit for 10 minutes.
Add remaining ingredients, except cilantro, and blend on high speed, scraping down sides of bowl as needed, until creamy and smooth, about 3 minutes. If too thick, add boiling water until desired consistency is reached.
Transfer queso to serving bowl and top with cilantro, if desired. Leftovers may be refrigerated in an airtight container for 3 days.
Recipe Notes
Per 1/4 cup serving: 77 calories; 6 g protein; 4 g total fat (0 g sat. fat); 7 g total carbohydrates (1 g sugars, 4 g fiber); 82 mg sodium