Baked Overnight Oats is one big pan of warm, comforting berries, raisins, nuts, and oats that's made the night before and popped into the oven to bake and be enjoyed in the morning. It's the perfect thing for breakfast entertaining. I love having a healthy breakfast that's also such a treat!

bowls and pan of overnight oats with text

The leftovers are good a few days later, too. They're fine cold if you're in a hurry. If you can warm them up in a covered dish for 10 minutes at 300 degrees F, they're even better. We use our toaster oven. You could reheat the leftovers in a microwave, if you have one. We've been enjoying my test batch for days. This stuff is good!

Origin of This Baked Overnight Oats Recipe

We spent Christmas with my daughter and her family. She is a great menu planner, and of course we put special attention into planning the holiday meals. We needed something special for Christmas morning, and she has really been into overnight oats lately. At the same time, this recipe for Overnight Oatmeal Cookie Casserole from Food Bloggers of Canada crossed my screen.

I made several changes to the FBC recipe, the most important one for me being the certified gluten-free oats. Since neither of us is overly fond of bananas (although our husbands love them!), we replaced bananas with berries. I used dairy-free milk and raw cane sugar to suit my dietary preferences. Then at home, I tested the recipe again with coconut sugar. The recipe I bring you here is the delicious result of that evolution.

top down view of oatmeal, pecans, and raisins casserole in two bowls and a pan

Are Overnight Oats Gluten Free?

Overnight oats are gluten-free if you make them with certified gluten-free oats. The certification is especially important with oats because, without it, they have most likely been contaminated by wheat. Read more about that in Start Here.

banner with blueberry muffins to the left and text in remaining white space

How to Serve Overnight Oats

You can pour your favourite milk over your overnight oats, but I like mine just as is. It's delicious, cozy, and comforting, scooped from the pan hot out of the oven. Yum!

two bowls of oatmeal casserole with pan in background

Dairy Free Overnight Oats

These overnight oats are easily made dairy-free by using a dairy-free milk such as almond, cashew, or coconut milk. If you really need to avoid all dairy completely, just leave off the butter at the end.

After years of using dairy-free milk on breakfast cereal, I don't actually like the taste of regular milk anymore. I do still like butter, though. Fortunately for me, my problem is with the casein in cows' dairy, so I can still enjoy butter. Yay!

How to Prepare Overnight Oats

berries and chopped, peeled apples spread over bottom of pyrex baking pan

1. Spread out berries and apples in pan.

2. Layer on the oat mixture.

nuts and raisins scattered over casserole

3. Pour over pecan and raisins mixture.

4. Pat on butter, if desired, and bake.

flat lay of casserole with oatmeal, raisins, and pecans in rectangular pyrex pan

More Gluten-Free Breakfast Ideas

Recipe

bowl of baked oatmeal with raisins and pecans on top

Overnight Oats

Baked Overnight Oats is a great gluten free meal prep dish that can be served warm to everyone in the morning. It features berries, apples, raisins, and pecans.

5 from 3 votes

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Course: Breakfast

Cuisine: American, Canadian

Keyword: dairy free, gluten free, overnight oatmeal, overnight oats

Prep Time: 15

Cook Time: 30

Total Time: 45

Servings:

Calories: 288kcal

Author: Cathy

Equipment

9" X 13" pyrex baking dish

Ingredients

4 cups frozen mixed berries (1 600 g package)
3 cups apples peeled and chopped
3 cups coarse gluten free oats
½ cup coconut sugar or raw cane sugar
1 teaspoon ground cinnamon
1 teaspoon baking powder
¼ teaspoon fine sea salt
2 eggs
2 cups nondairy milk
1 teaspoon vanilla extract
1 cup sultana raisins
¾ cup pecans pieces
¼ cup cubed butter (optional, omit for dairy free)

Instructions

Butter the inside of a 3-quart casserole dish or 9" X 13" oblong glass baking pan.
Evenly spread the berries and chopped apples over the bottom of the dish.
In a large mixing bowl, whisk together the oats, sugar, cinnamon, baking powder, and salt. Sprinkle evenly over the fruit.
In another bowl, whisk together the eggs, milk, and vanilla.
Add the raisins and pecans and stir into the liquid mixture. Pour it slowly and evenly over the other layers in the baking dish.
Optionally, sprinkle cubes of butter over the top.
Cover with lid, foil, or plastic wrap and refrigerate overnight.
In the morning, preheat oven to 375° F. Remove the casserole from refrigerator and uncover it. Bake for 30 minutes. Serve warm.

Notes

Leftover Baked Overnight Oats keeps well in the refrigerator for a few days. You can eat it cold but may prefer to reheat it.

Nutrition

Serving: 6oz | Calories: 288kcal | Carbohydrates: 39g | Protein: 5g | Fat: 11g