Sliced Mixed Berry Jam Bar with berries and a spoon of jam

Mixed Berry Oatmeal Jam Bars

Super simple Mixed Berry Oatmeal Jam Bars are everything you would think of in a summer dessert! Fresh fruit that is quickly made into your own homemade jam makes these jam bars delish!
Course Dessert
Cuisine American
Keyword jam bars
Prep Time 15 minutes
Cook Time 35 minutes
Servings 36
Calories 137kcal


Mix Berry Jam Bar Oatmeal Base

  • 2 1/2 cups flour
  • 2 cups old fashioned oats don't use quick oats for this recipe
  • 2 sticks butter softened to room temperature
  • 1 cup sugar
  • 1/2 cup brown sugar
  • 2 tsp baking soda
  • 1 tsp salt

Mixed Berry Freezer Jam

  • 1 2/3 cup mixed berries use any combination you like
  • 2/3 cup sugar
  • 2 tbs Freezer Pectin


  • Preheat the oven to 350 degrees.
  • Spray the 9x9 square pan or line it with parchment or foil as shown in photos.
    Aluminum wrapped stone dish with a pressed oatmeal crust
  • Combine the dry ingredients and mix.
  • Melt butter and add to the dry ingredients. The mixture should start to make crumbles.
  • Press 1/2 of the mixture into the bottom of the 9x9 pan and press to make a crust.
  • Pour the jam on top of the crust.
    Spreading the jam across the oatmeal crust to form the center of the jam bars
  • Sprinkle the remaining oatmeal mixture on top.
    Wooden spoon sprinkling on the oatmeal mix for the topping

Freezer Jam (on the inside label of the pectin jar)

  • Combine the pectin along with the fruit and sugar and mash for 3 minutes.
    Use a masher to pulverize the fruit mixture to form the jam
  • Place in jars and allow to set for 30 minutes.
    Mason jar with mixed berry jam poured inside
  • Put in refrigerator for up to 3 months or freezer for up to 12 months.


The recipe for the jam will make enough for one batch of Mixed Berry Oatmeal Jam Bars. I usually have about ¼ cup of jam leftover. 
If you find your jam is runny, add a little bit of corn starch to it to help it bind together when it cooks. It will also set up nicely once you place them in the refrigerator after cooking and cooling. 
You can substitute other jams with no problem. If you don't want to invest in making your own jam, go ahead and buy your favorite instead. 


Serving: 1bar | Calories: 137kcal | Carbohydrates: 22g | Protein: 1g | Fat: 6g | Saturated Fat: 3g | Cholesterol: 13mg | Sodium: 225mg | Potassium: 43mg | Fiber: 1g | Sugar: 15g | Vitamin A: 160IU | Vitamin C: 0.2mg | Calcium: 14mg | Iron: 1mg