crisp salted oatmeal white chocolate cookies

INGREDIENTS

• 1 cup all-purpose flour
• 3/4 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon table salt
• 14 tablespoons (1 3/4 sticks) unsalted butter, slightly softened
• 1 cup sugar
• 1/4 cup packed light brown sugar
• 1 large egg
• 1 teaspoon vanilla extract
• 2 1/2 cups old-fashioned rolled oats
• 6 ounces good-quality white chocolate bar, chopped (not “white chocolate” chips; they’re almost always artificial. I am adamant about this.)
• 1/2 teapoon flaky sea salt (like Maldon or fleur de sel) (for sprinkling on top)