Fudgy Oat Brownies Recipe
Fudgy Oat Brownies Recipe photo by Taste of Home

Fudgy Oat Brownies Recipe

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4.5 8 14
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These cake-like brownies have a rich crunchy oat crust and a smooth homemade chocolate frosting. A packaged brownie mix makes the recipe easy to prepare. You can make it even easier by using canned frosting.
TOTAL TIME: Prep: 30 min. Bake: 35 min. + cooling
MAKES:36 servings
Contest Winning Test Kitchen Approved
TOTAL TIME: Prep: 30 min. Bake: 35 min. + cooling
MAKES: 36 servings


  • 1-1/2 cups quick-cooking oats
  • 3/4 cup all-purpose flour
  • 3/4 cup packed brown sugar
  • 1/4 teaspoon baking soda
  • 1/4 teaspoon salt
  • 3/4 cup butter, melted
  • 1 package fudge brownie mix (13-inch x 9-inch pan size)
  • 3 tablespoons butter
  • 1-1/2 ounces unsweetened chocolate
  • 2-1/4 cups confectioners' sugar
  • 3 to 4 tablespoons hot water
  • 1-1/2 teaspoons vanilla extract


  1. In a large bowl, combine the oats, flour, brown sugar, baking soda and salt. Stir in butter until combined. Press into an ungreased 13-in. x 9-in. baking pan. Bake at 350° for 10-11 minutes or until puffed and edges are lightly browned.
  2. Meanwhile, prepare brownie mix according to package directions for cake-like brownies. Spread batter over crust. Bake 25-30 minutes longer or until a toothpick inserted near the center comes out clean.
  3. For frosting, in a microwave-safe bowl, melt butter and chocolate; stir until smooth. Immediately stir in the confectioners' sugar, 2 tablespoons water and vanilla until smooth. Add remaining water; stir until smooth. Immediately spread over brownies. Cool on a wire rack until firm. Cut into bars. Yield: 3 dozen.
Originally published as Fudgy Oat Brownies in Taste of Home April/May 2005, p31

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Reviewed Mar. 8, 2015

"These brownies are always a hit! They are easy to make especially using your favorite brownie mix. Sometimes I cheat and use bought chocolate frosting that I melt a little before spreading on."

Reviewed Oct. 9, 2014

"I made these today at my work, which is a private lodge and I supply a lunch dessert daily. I am always on the lookout for brownie variations. These were delicious! very unique, to have an oat cookie base. I made my own favorite brownie recipe to top them, and a whipped ganache for the frosting. I needed a large amount, so I doubled all ingredients. Thank you for a great recipe!"

Reviewed Aug. 16, 2014

"Used the Five Star Brownie recipe here instead of a mix. AWESOME!!"

Reviewed Jul. 8, 2014

"These were so indulgent. I added chocolate chips to the brownie batter and frosted with peanut butter frosting. They looked very pretty and tasted even better. Great way to jazz up a boxed brownie mix. A winner!"

Reviewed Jun. 29, 2014

"I recall preparing these brownies when they appeared in the 2005 Brownie Contest for Taste of Home! I'd greased and floured my baking pan (13x9x2") and I'd used 3-1/4 cups of confectioners' sugar! I plan to use this recipe again! It's a great recipe to use and for me, it's a keeper! delowenstein"

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