Toss the chickpeas with the curry powder, 1 teaspoon of the oil, 1/4 teaspoon salt and a few grinds of black pepper in a medium bowl. Place on one side of a baking sheet. Arrange the onions next to the chickpeas, then the sweet potatoes and lastly the mushrooms. Toss the onions, sweet potatoes and mushrooms with the remaining 3 teaspoons oil, 1/4 teaspoon salt and a generous amount of black pepper. Bake until the chickpeas are a bit crunchy and the sweet potatoes are softened and starting to turn brown in a few spots, 25 to 30 minutes.
Meanwhile, whisk the yogurt, tahini and juice of half the lemon in a small bowl. Slice the remaining lemon into wedges.
Divide the quinoa between two bowls. Arrange half the vegetables and avocado slices on top of the quinoa, leaving a space for the yogurt in the middle. Dollop the yogurt in the empty space and serve with the lemon wedges.
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