Place quinoa in a saucepan and add a healthy pinch of sea salt and 1 ¾ cups water. Bring to a boil, cover, and lower to a simmer. Cook until water is absorbed, about 15 minutes. Turn off the heat and allow to sit covered for 10 minutes.
Transfer quinoa to a serving bowl and allow to cool slightly. If you’re in a pinch, you can spread the quinoa on a baking sheet to cool faster. Fluff with a fork.
Add jicama, tomatoes, jalapeño, scallions and cilantro to the quinoa. Toss to combine.
Place avocado in a blender or food processor and blend with the lime juice and 1/2 teaspoon salt until smooth. Add a few tablespoons of water (I added 2) to achieve a consistency like whipped cream.
Pour avocado dressing over quinoa salad and season with pepper. Toss to combine. Taste for seasoning. Top with crumbled cheese, if desired.