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1
Place butter on a plate and freeze until very firm, about 15 minutes.
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2
Pulse flour, sugar, baking powder, salt, and baking soda in a food processor until combined. Add frozen butter and pulse until mixture resembles sand and no visible clumps of butter remain, 1-2 minutes. Transfer to an airtight container and chill.
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3
Mix can be made 1 month ahead. Keep chilled.
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4
To make a batch of 4 pancakes, whisk 1 cup mix, 1 large egg, and 1/2 cup milk or 3/4 cup buttermilk in a medium bowl to combine.
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5
Heat a griddle or large cast-iron or nonstick skillet over medium; brush with butter. Drop batter by 1/4-cupfuls onto griddle. Cook pancakes until bubbles form on the surface and pop and the underside is golden brown, 2-3 minutes. Turn and cook until lightly browned on the other side, 1-2 minutes more. Repeat with remaining batter, brushing griddle with butter as needed.
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6
To make a batch of 4 small or 2 large waffles, separate 2 large eggs. Whisk egg yolks, 2 cups mix, and 1/2 cup milk or 3/4 cup buttermilk in a large bowl.
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7
Using an electric mixer on medium-high speed, beat egg whites in a medium bowl until stiff peaks form. Gently fold into batter.
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8
Heat a waffle iron until very hot; brush with butter. Working in batches and brushing iron with more butter as needed, pour batter onto iron (it should cover the entire surface; the amount of batter will vary according to manufacturer). Cook waffles until golden brown and cooked through, 3-7 minutes, depending on waffle iron.
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9
To make a batch of 4 crepes, whisk 2 eggs, 1 cup mix, and 1 cup milk in a medium bowl to combine.
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10
Heat a medium nonstick skillet over medium-high, then brush with butter. Ladle about 1/4 cup batter into skillet and swirl to evenly coat bottom. Cook crepe until bubbles form on the surface and edges are golden and crisp, about 3 minutes. Slide a spatula underneath crepe to loosen and carefully turn. Cook until a few brown spots appear, about 15 seconds. Transfer to a plate. Tent with foil to keep warm while you cook remaining crepes.
