Make the dressing: combine all the dressing ingredients in a food processor and pulse until liquefied (you might need to add more or less water.)
Make the roasted corn and peppers: Preheat the oven to 400 °F. Combine the corn kernels, chopped peppers, olive oil and umami seasoning in a large bowl. Spread the mixture on a parchment-lined baking sheet and bake for about 8 to 10 minutes. (Target sells inexpensive umami seasoning.)
Squeeze the water out of the cottage cheese by wrapping it in a cheesecloth, tying the cheesecloth to the handle of a spoon and hanging it over a bowl for a few hours until the liquid drains out. Alternatively, you could also use queso fresco, cotija cheese, goat cheese or feta cheese. (We just really love cottage cheese.)
Cook the quinoa according to package instructions.
You can toast the sunflower seed kernels if you want - put them in a small skillet over medium heat and gently stir them around for 2 to 3 minutes until lightly browned.
Arrange the lettuce, quinoa, roasted corn and peppers, tomato, avocado, red onions, black beans, cheese, sunflower kernels and dressing in a bowl.
Notes
**Sweetgreen adds crushed tortilla chips to their Elote bowl and you can do that too, but I skipped them. Late July's chia and quinoa tortilla chips are the lowest-sodium I've found and they are pretty good.