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In large mixing bowl, whisk together flour, sugar and salt.
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With grater, using large holes, grate butter into dry ingredients. With fork, toss together butter and flour until butter pieces are evenly coated with flour.
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Add sour cream to mixing bowl and use hands or fork tines to mash large clumps of sour cream into flour/butter mixture. (Note: If it’s very dry, add tablespoon of ice water. A few dry spots or cracks in dough is fine.)
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Press mixture into thick disc and cover in plastic wrap. Refrigerate at least 30 minutes or up to several days.
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Using rolling pin, roll out crust on lightly floured counter to about 1/8-inch thick.
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Using 2-inch cookie cutter, cut 12 circles.
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To 12-cup muffin tin lightly sprayed with oil, press in each circle of dough.