Here is a straightforward recipe to make oatmeal cookies: Ingredients:

• 1 cup all-purpose flour
• ½ tsp baking soda
• ¼ tsp baking powder
• ½ tsp salt
• ½ tsp ground cinnamon
• ½ cup salted butter (softened)
• ½ cup granulated sugar
• ½ cup light brown sugar (packed)
• 1 egg
• 1 tsp vanilla extract
• 1½ cups old-fashioned oatmeal
• 1 cup mix-ins of choice (e.g., chocolate chips, raisins, nuts)

Instructions:

1. Preheat oven to 375°F (190°C) and line baking sheets with parchment or silicone mats.
2. In a small bowl, combine flour, baking soda, baking powder, salt, and cinnamon.
3. In a mixer, beat softened butter with granulated and brown sugars until light and fluffy (about 1 minute).
4. Add egg and vanilla, beating for an additional minute.
5. Mix in the dry ingredients until just combined.
6. Stir in the oatmeal and desired mix-ins until evenly distributed.
7. Scoop dough into 1½ to 2 tablespoon-sized balls, place on sheets about 1½ inches apart, and lightly flatten the tops.
8. Bake for 8–10 minutes until the edges are lightly browned and the tops are set.
9. Let cookies rest on the baking sheet for 5 minutes before transferring to a wire rack to cool.

This recipe yields oatmeal cookies with crispy edges and soft, chewy centers without the need for dough chilling. Mix-ins like raisins, chocolate chips, nuts, or dried fruit can be added for variation.