Lightly spoon flour into a dry measuring cup;
level with a knife. Combine flour, soda, and salt;
set aside. Melt butter in a large saucepan over
medium heat. Remove from heat; stir in cocoa
powder and sugars (mixture will resemble coarse
sand). Add yogurt and vanilla, stirring to
combine. Add flour mixture, stirring until moist.
Drop by level tablespoons 2 inches apart onto
baking sheets coated with cooking spray.
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