Step 1: Prepare the Steel Cut Oats: Pour boiling water over the steel cut oats in a bowl. Let stand for at least 15 minutes to soften. This pre-soaking step ensures the oats are tender and chewy in the final cookie.
Step 2: Combine Dry Ingredients: In a medium bowl, whisk together the flour, baking soda, cinnamon, nutmeg, and salt. This ensures even distribution of the spices and leavening agent.
Step 3: Cream Butter and Sugars: In a large bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy. This incorporates air into the batter, resulting in a tender cookie.
Step 4: Incorporate Wet Ingredients: Beat in the eggs one at a time, then stir in the vanilla extract. Ensure each egg is fully incorporated before adding the next.
Step 5: Combine Wet and Dry: Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Avoid overmixing, as this can develop the gluten in the flour and result in a tough cookie.
Step 6: Add Oats and Raisins: Stir in the softened steel cut oats and raisins until evenly distributed throughout the dough.
Step 7: Chill the Dough (Optional): For a slightly thicker cookie, cover the dough and chill in the refrigerator for at least 30 minutes. This allows the flavors to meld and the dough to firm up.
Step 8: Preheat Oven and Prepare Baking Sheets: Preheat oven to 375F (190C). Line baking sheets with parchment paper.
Step 9: Drop Dough onto Baking Sheets: Drop rounded tablespoons of dough onto the prepared baking sheets, leaving about 2 inches between each cookie.
Step 10: Bake: Bake for 12-15 minutes, or until the edges are golden brown and the centers are set.
Step 11: Cool: Let the cookies cool on the baking sheets for a few minutes before transferring them to a wire rack to cool completely.
Tips and Substitutions: For a nuttier flavor, add 1/2 cup of chopped walnuts or pecans to the dough. If you don't have raisins, dried cranberries or chopped dates make a delicious substitution. For a vegan option, replace the butter with a plant-based butter alternative and use flax eggs (1 tablespoon ground flaxseed mixed with 3 tablespoons water per egg).