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stacked oatmeal bars with m&ms baked in
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5 from 8 votes

Loaded Oatmeal Blondies

Oatmeal Cookie Bars filled with anything you like - this is the perfect recipe to clean out your baking cabinet!
Prep Time15 minutes
Cook Time25 minutes
Total Time40 minutes
Course: Dessert
Cuisine: American
Servings: 24 bars
Calories: 194kcal
Author: Dorothy Kern
Cost: $5


  • ½ cup (113g) unsalted butter , softened
  • 1 ¼ cups (250g) packed brown sugar
  • 1 large egg
  • 1 teaspoon vanilla extract
  • ½ teaspoon salt
  • ½ teaspoon baking soda
  • 1 teaspoon cinnamon
  • 1 cup (124g) all-purpose flour
  • 1 ½ cups Quick Cooking Oats
  • 2 cups of mix-ins (see note)


  • Preheat oven to 350°F. Line a 9x13” pan with foil and spray with cooking spray. (Foil is optional; I like using it for easy removal.)
  • Cream brown sugar and butter in the bowl of an electric mixer fitted with a paddle attachment. Add eggs and vanilla and beat until combined. Mix in salt, baking soda, and cinnamon. Add flour and mix until combined. Stir in oats. Stir in your mix-ins.
  • Press into prepared pan (dough is sticky, spray your hands with cooking spray to avoid it sticking to your hands). If you want, you can sprinkle a few more of your mix-ins on the top to make them look prettier (as I did with the mini M&Ms in the pictures).
  • Bake for about 25 minutes. (Be careful not to overcook - the center will still be jiggly when you take these out of the oven and they will finish cooking and firming up as they cool.) Cool completely before slicing into squares.
  • Store in an airtight container for up to 4 days or freeze for up to 2 months.



Mix-Ins: Use anything you want! Just make sure to use 2 cups total of whatever you choose. Here are some ideas:
  • Chocolate Chips (White, milk, semi-sweet)
  • Butterscotch or peanut butter chips
  • M&Ms or Reese's Pieces
  • Toffee Bits
  • Butterfinger Bits
  • Chopped Nuts
  • Chopped peanut butter cups
  • Shredded Sweetened Coconut


Serving: 1bar | Calories: 194kcal | Carbohydrates: 28g | Protein: 2g | Fat: 9g | Saturated Fat: 5g | Polyunsaturated Fat: 0.3g | Monounsaturated Fat: 1g | Trans Fat: 0.2g | Cholesterol: 18mg | Sodium: 78mg | Potassium: 86mg | Fiber: 1g | Sugar: 20g | Vitamin A: 130IU | Vitamin C: 0.003mg | Calcium: 27mg | Iron: 1mg