Preheat oven to 400°. In a large bowl, whisk the first 5 ingredients. In another bowl, whisk yogurt, egg, melted butter and lemon zest until blended. Add to flour mixture; stir just until moistened. Fold in blueberries.
Drop by 1/3 cupfuls 1 in. apart onto a greased baking sheet. Bake 15-18 minutes or until light brown.
In a small bowl, combine glaze ingredients; stir until smooth. Drizzle over warm biscuits.
If using frozen blueberries, use without thawing to avoid discoloring the batter.
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