Easy One Bowl Oatmeal Cookies: The Ultimate Simple Recipe for Perfect Chewy Treats
Easy One Bowl Oatmeal Cookies: The Ultimate Simple Recipe for Perfect Chewy Treats

Who says making delicious homemade cookies has to be complicated? These easy one bowl oatmeal cookies are about to become your new go-to recipe for quick, satisfying treats that require minimal effort and cleanup. Perfect for busy weeknights, last-minute gatherings, or when that cookie craving strikes unexpectedly, this recipe delivers chewy, flavorful oatmeal cookies without the fuss of multiple bowls or special equipment.
What makes these cookies truly special is their simplicity. You’ll mix everything in one bowl, use basic pantry staples, and have warm cookies ready in under 30 minutes. Whether you’re a baking beginner or a seasoned pro looking for a hassle-free option, these oatmeal cookies are guaranteed to impress.

Ingredients
- 1 cup all-purpose flour
- 1 teaspoon baking soda
- 1/2 teaspoon salt
- 1/2 teaspoon cinnamon
- 1/2 cup unsalted butter, softened
- 1/2 cup brown sugar, packed
- 1/4 cup granulated sugar
- 1 large egg
- 1 teaspoon vanilla extract
- 1 1/2 cups old-fashioned oats
- 1/2 cup raisins or chocolate chips (optional)
Step-by-Step Instructions
Step 1: Prepare Your Ingredients
Start by gathering all your ingredients and preheating your oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone baking mats. Having everything ready before you begin makes the process even smoother.
Step 2: Mix Dry Ingredients
In your large mixing bowl, whisk together the flour, baking soda, salt, and cinnamon. This ensures your leavening agents are evenly distributed throughout the cookie dough.
Step 3: Combine Wet Ingredients
Add the softened butter, brown sugar, and granulated sugar to the same bowl. Use a wooden spoon or spatula to mix until well combined. The mixture should be creamy and smooth.
Step 4: Add Egg and Vanilla
Beat in the egg and vanilla extract until fully incorporated. Don’t worry about overmixing at this stage – the goal is to create a uniform mixture.
Step 5: Incorporate Oats and Mix-ins
Stir in the oats until they’re evenly distributed throughout the dough. If you’re adding raisins, chocolate chips, or other mix-ins, fold them in now. The dough will be thick and slightly sticky.
Step 6: Scoop and Bake
Using a tablespoon or cookie scoop, drop rounded tablespoons of dough onto your prepared baking sheets, spacing them about 2 inches apart. Bake for 10-12 minutes, or until the edges are golden brown and the centers look set.
Step 7: Cool and Enjoy
Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely. They’ll continue to set as they cool, resulting in that perfect chewy texture.
Expert Tips for Perfect One Bowl Oatmeal Cookies
Butter Temperature Matters: Use softened butter, not melted. Softened butter creams better with the sugars, creating a lighter texture. If your butter is too hard, microwave it for 5-10 seconds at a time until soft but not melted.
Don’t Overbake: The cookies will continue to cook on the hot baking sheet after you remove them from the oven. Take them out when the edges are golden but the centers still look slightly underdone for maximum chewiness.
Customize Your Cookies: Feel free to add 1/2 cup of your favorite mix-ins. Chopped nuts, dried cranberries, white chocolate chips, or even shredded coconut all work beautifully.
Storage Tips: Store cooled cookies in an airtight container at room temperature for up to 5 days. For longer storage, freeze the baked cookies for up to 3 months.
Frequently Asked Questions
Can I use quick oats instead of old-fashioned oats?
Yes, but the texture will be slightly different. Quick oats will result in a denser, less chewy cookie. Old-fashioned oats provide the best texture.
Can I make these cookies gluten-free?
Absolutely! Simply substitute the all-purpose flour with your favorite gluten-free flour blend. The recipe works beautifully with most 1:1 gluten-free flour substitutes.
Why are my cookies spreading too much?
This usually happens if your butter was too soft or melted. Make sure your butter is softened but still cool to the touch. Chilling the dough for 15-20 minutes before baking can also help.
Can I double this recipe?
Yes, this recipe doubles easily. Just make sure your mixing bowl is large enough to accommodate all the ingredients comfortably.
These easy one bowl oatmeal cookies prove that delicious homemade treats don’t have to be complicated. With minimal cleanup and maximum flavor, they’re the perfect solution for busy days, spontaneous baking sessions, or when you simply want a warm, comforting cookie without the fuss. Happy baking!

Easy One Bowl Oatmeal Cookies: The Ultimate Simple Recipe for Perfect Chewy Treats
Ingredients
Method
- Prepare your ingredients and preheat oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone baking mats.
- In a large mixing bowl, whisk together the flour, baking soda, salt, and cinnamon.
- Add softened butter, brown sugar, and granulated sugar to the same bowl and mix until creamy and smooth.
- Beat in the egg and vanilla extract until fully incorporated.
- Stir in the oats until evenly distributed, then fold in optional raisins or chocolate chips if using.
- Drop rounded tablespoons of dough onto prepared baking sheets, spacing 2 inches apart. Bake for 10-12 minutes until edges are golden brown.
- Let cookies cool on baking sheet for 5 minutes before transferring to wire rack to cool completely.
