Soak the raisins. Set the raisins in a bowl of warm water and soak for 15 minutes. Drain well and pat dry with paper towels.
Preheat the oven. Preheat to 350°F (175°C) with a rack in the center. Line two baking sheets with parchment paper.
Whisk the dry ingredients. In a medium bowl, whisk together the flour, baking soda, baking powder, cinnamon, and salt. Set aside.
Cream the butter and sugars. In a stand mixer fitted with the paddle attachment, cream the butter, brown sugar, and granulated sugar on medium-high speed for about 2 minutes, until light and fluffy.
Add the egg and vanilla. Beat in the egg and vanilla extract until fully incorporated, scraping down the bowl as needed.
Add the flour mixture. With the mixer on low, gradually beat in the flour mixture until just combined. Don't overmix.
Fold in the oats, raisins, and chocolate. Mix in the oats, drained raisins, and chocolate chips until just incorporated. The dough will be thick.
Portion the dough. Divide into 16 dough balls, about 2 inches in diameter, using a 3-Tbsp or 2 oz cookie scoop. Flatten each ball slightly with the back of a measuring cup.
Bake. Bake one sheet at a time for 12–14 minutes, until the edges are just slightly golden. Do not overbake.
Cool. Cool the cookies in the pan for 5 minutes, then transfer to a wire rack to cool completely.