INGREDIENTS
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1 small sweet potato
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6 tablespoons olive oil, divided
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Kosher salt, freshly ground pepper
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1 portobello mushroom
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1/2 small zucchini
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1 small shallot, finely chopped
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1/4 teaspoon crushed red pepper flakes
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1 cup cooked quinoa (from about 1/2 uncooked)
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3/4 cup dried breadcrumbs
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1 1/2 teaspoons fresh lemon juice
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4 English muffins, split, toasted
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Guacamole, tomato chutney, and sprouts (for serving; optional)