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No-bake chocolate oatmeal bars with a chewy oat layer, peanut butter chocolate filling, and chocolate drizzle on top.

Easy No Bake Chocolate Oatmeal Bars Recipe Everyone Will Want Again

These no-bake chocolate oatmeal bars are exactly the kind of dessert that earns repeat status. They are easy, deeply chocolatey, full of peanut butter flavor, and simple enough to make whenever you want something homemade without a lot of effort. If you like cozy no-bake treats with classic flavor, this is a great one to save.

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Prep Time 15 minutes
Cook Time 10 minutes
Total Time 20 hours 20 minutes
Servings: 12 bars
Course: Dessert
Cuisine: American-style no-bake dessert bars
Ingredients Method Notes

Ingredients
  

  • 1 cup butter
  • 1/2 cup packed brown sugar
  • 1 teaspoon vanilla extract
  • 3 cups rolled oats
  • 1 cup semisweet or dark chocolate chips
  • 1/2 cup peanut butter

Method
 

  1. Line an 8-inch or 9-inch square pan with parchment so the bars are easier to lift out later. The source also notes that a 9x13-inch pan works if you want thinner bars.
  2. In a large saucepan over medium heat, melt the butter and brown sugar together until the butter is fully melted and the sugar has dissolved. Stir in the vanilla.
  3. Add the rolled oats and cook everything over low heat for 3 to 4 minutes, just until the mixture looks evenly combined.
  4. Press about half of the oat mixture into the prepared pan to make the base, and save the rest for the top layer.
  5. In a microwave-safe bowl, melt the peanut butter and chocolate chips together, stirring until the mixture is smooth.
  6. Spread the chocolate filling over the oat base, saving about 1/4 cup for the drizzle on top.
  7. Add the remaining oat mixture over the chocolate layer, press it down gently, and finish with the reserved chocolate mixture drizzled over the top.
  8. Refrigerate the bars for 2 to 3 hours, or overnight, until firm. The source recommends letting them come closer to room temperature before cutting.

Notes

The most important texture tip in the source is the sugar mixture timing. These bars set best when the butter and brown sugar cook long enough to combine properly, but not so long that the finished layers become dry.
A smaller square pan will give you thicker, more bakery-style bars, while a larger pan will give you a thinner, more snackable version. That flexibility is built into the source recipe notes.
For the smoothest filling, melt the chocolate and peanut butter gently and stir until fully glossy before spreading. That is supported by the source method, which specifically calls for melting and stirring until smooth.
Letting the chilled bars sit briefly before slicing can make cutting easier. The source recommends bringing them closer to room temperature before cutting.