Easy and quick oatmeal cookies made in one bowl without a mixer or chilling time—perfect for a fast, chewy, and delicious treat.

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Preheat the oven to 350°F (175°C). Line baking sheets with parchment paper.
In a large bowl, whisk together the melted butter, brown sugar, and granulated sugar until smooth.
Add the eggs and vanilla extract, whisking until fully combined.
Stir in the flour, baking soda, salt, and cinnamon until just combined.
Fold in the oats and optional add-ins like raisins or chocolate chips.
Drop spoonfuls of dough onto prepared baking sheets, spacing them about 2 inches apart.
Bake for 10–12 minutes or until edges are golden and centers are set.
Let cookies cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.

Use quick oats for a softer texture or stick with rolled oats for a chewier cookie.
Cookies will continue to cook slightly after removing from oven; avoid overbaking.
Store in an airtight container for up to a week.