INGREDIENTS
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1/2 cup plus 2 tablespoons (1 1/4 sticks) unsalted butter, room temperature, plus more for pan
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2 cups all-purpose flour, plus more for pan
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4 summer squash (combination of zucchini and yellow squash)
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1 cup shelled unsalted pistachios, coarsely chopped
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1 teaspoon salt
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1 1/2 teaspoons baking powder
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1 1/4 cups sugar
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4 large eggs
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1 teaspoon vanilla extract
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2 teaspoons fennel seeds