Chewy 3-ingredient Oatmeal Cookies

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½ cup smooth peanut butter (well-stirred if using natural peanut butter)

½ cup maple syrup

1 ½ cups quick-cooking oats

1 teaspoon ground cinnamon

¼ cup mini or regular chocolate chips

¼ cup raisins

Arrange a rack in the middle of the oven and heat the oven to 350ºF. Line a rimmed baking sheet with parchment paper or a silicone baking mat.
Place ½ cup smooth peanut butter and ½ cup maple syrup in a medium bowl. Mix with a flexible spatula until well-combined. Add 1 ½ cups quick-cooking oats and any optional mix-ins, if using. Mix until combined and no dry spots on the oats remain.
Scoop the dough out into 2-tablespoon portions (14 to 15). Place about 1 inch apart on the baking sheet. The cookies will not spread as they bake, so dampen your hands and flatten each dough ball with your fingertips until about 2 inches wide and ½-inch thick.
Bake for 5 minutes. Rotate the baking sheets from front to back. Bake until the edges are set and starting to brown, 5 to 6 minutes more. Let the cookies cool on the baking sheets for 5 minutes, then transfer to a wire rack and let cool completely.