- Adjust oven rack to middle position and heat oven to 200 degrees. Spray wire rack set inside rimmed baking sheet with vegetable oil spray; place in oven.
- Whisk 2 cups (10 ounces) all-purpose flour, 2 tablespoons sugar, 1 teaspoon baking powder, ½ teaspoon baking soda, and ½ teaspoon table salt together in medium bowl. In second medium bowl, whisk 2 cups buttermilk, ¼ cup sour cream, 2 large eggs, and 3 tablespoons melted and cooled unsalted butter together.
- Make well in center of dry ingredients and pour in wet ingredients; gently stir until just combined (batter should remain lumpy with few streaks of flour). Do not overmix. Let batter sit 10 minutes before cooking.
- Heat 1 teaspoon vegetable oil in 12-inch nonstick skillet over medium heat until shimmering. Using paper towels, carefully wipe out oil, leaving thin film on bottom and sides of pan.
- Using ¼-cup dry measuring cup, portion batter into pan in 4 places. Cook until edges are set, first side is golden brown, and bubbles on surface are just beginning to break, 2 to 3 minutes.
- Using thin, wide spatula, flip pancakes and continue to cook until second side is golden brown, 1 to 2 minutes longer. Serve pancakes immediately, or transfer to prepared wire rack and place in oven to keep warm. Repeat cooking remaining batter, using remaining oil as necessary.
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