Make the quinoa: Bring the quinoa and 2 1/2 cups water to a boil in a large saucepan over medium-high heat. Cover, reduce the heat to medium-low and gently simmer until the quinoa is tender (the little tails will pop out) and most of the water is absorbed, 20 to 25 minutes Drain off any excess water. Stir in the chopped cilantro, scallions, oil and 1/2 teaspoon salt. Serve warm or at room temperature. (The quinoa can be cooked, cooled and refrigerated, covered, for up to 2 days. Microwave just enough to take the chill off, about 2 minutes, stirring about halfway through.)
Make the avocado cream: While the quinoa cooks, process or blend the avocado, sour cream, Parmesan, lime juice, 1 tablespoon water, cayenne and 3/4 teaspoon salt in a food processor or blender until smooth and creamy.
If the corn still has a chill, microwave it for about 1 minute.
Build the bowls: Divide the quinoa evenly among 4 bowls. Top each with neat piles and/or rows of chicken, tortilla chips, corn, salsa and pepitas. Top with some sauce, a sprig of cilantro and a lime quarter.
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