INGREDIENTS
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1 1/2 cups all-purpose flour
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1 cup old-fashioned rolled oats
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1 teaspoon baking powder
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1/2 teaspoon ground cinnamon
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1/2 teaspoon salt
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1/2 cup (1 stick) unsalted butter, softened
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3/4 cup firmly packed light brown sugar
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1/2 cup crunchy peanut butter
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2 large eggs
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1 teaspoon vanilla extract
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1/2 cup milk
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1/2 cup toffee bits, plus more (about 1 tablespoon) for the top of the cake