Bar cookies, Cookies and brownies, Dessert

Grandma’s Mistake Bars

Oatmeal crumb bars with a chocolate filling and golden crumb topping.
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Grandma's Mistake Bars layer a brown sugar and oatmeal crumb mixture with a smooth chocolate filling made with sweetened condensed milk.

Half the crumbs go into the pan first. Spoonfuls of the rest go over the chocolate layer before baking. The recipe makes 30 servings in 40 minutes.

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Before you start

Grease the baking pan and set out the two portions of oleo separately. The larger amount goes into the crumbs, and the stick goes into the chocolate filling.

Ingredient notes

  • Oleo: The recipe lists one amount for the oatmeal crumbs and a second amount for the filling. Keep them separate so the filling portion is ready to melt with the chocolate.
  • Chocolate chips and sweetened condensed milk: Melt these with the filling portion of oleo and stir until smooth before pouring the chocolate over the base.

Grandma's Mistake Bars recipe

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4.9 out of 5 from 789 ratings

Oatmeal crumb bars with a chocolate filling and golden crumb topping.

Grandma's Mistake Bars

Oatmeal crumb bars with a smooth chocolate and sweetened condensed milk filling between a crumb base and spoonfuls of topping.
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Prep Time 15 minutes
Total Time 40 minutes
Servings: 30
Course: Dessert
Ingredients Method

Ingredients
  

  • 1 cup oleo
  • 1 cup brown sugar, firmly packed
  • 1 cup all-purpose flour
  • 1/4 teaspoon salt
  • 1/2 teaspoon baking soda
  • 2 cups oatmeal
  • 1/2 cup oleo
  • 1 (12 ounce) packages chocolate chips
  • 1 cup eagle brand sweetened condensed milk

Method
 

  1. Cream together oleo and brown sugar, then add flour, salt, baking soda and oatmeal. Mix until it is crumbly. Put 1/2 the mixture into a greased 9x13 baking pan.
  2. Melt 1 stick of oleo, chocolate chips and sweetened condensed milk together. Stir until smooth.
  3. Pour chocolate mixture over oatmeal mixture, then drop spoonfuls of the rest of the oatmeal mixture on top. Bake at 350 for 25 minutes.

Tips for success

Stop mixing the oatmeal mixture when it is crumbly. Reserve half for the topping before adding the base to the pan.

Pour the smooth chocolate filling over the crumb base before dropping the reserved crumbs in spoonfuls.

Related recipes

Chocolate Sweetened Condensed Milk – Copycat Here, melted unsweetened chocolate is blended into sweetened condensed milk to make a chocolate mixture. Banana-Oatmeal Bars With Chocolate Chunks For another oatmeal and chocolate bar, this recipe uses mashed bananas, chocolate chunks and pecans. Brown Sugar and Oatmeal Shortbread This shortbread also combines brown sugar and oatmeal, pressed into a pan and baked as one layer.