Baking Support Muffins & Snack Bakes

Whole Wheat Banana Sheet Muffins

A pan of whole wheat banana sheet muffins that bakes faster than a muffin tin, uses up ripe bananas well, and gives a family breakfast squares worth freezing.

  • By Ruthann
  • Published March 17, 2026
  • Last reviewed March 17, 2026
  • Total time 39 min
  • Yield 15 squares

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If this is your kind of supper, breakfast, or bake, keepWIC Oatmeal Banana Muffin Squares, Peanut Butter Oat Breakfast Bars, and Peanut Butter Banana Breakfast Bake nearby for the next pan.

If you want a cleaner fix or a little backup, these guides helpHow to Substitute Whole Wheat for All-Purpose and When Butter, Oil, and Shortening Change the Pan.

If you want the household logic around this pan, keepAt 7:10, Breakfast Starts Too Fast — Here Is How We Hold It and By Wednesday, the Supper Plan Breaks — Here Is How We Catch It nearby too.

These are for the mornings when the bananas are ready, the muffin tin is not worth the trouble, and breakfast still needs to feed more than two people. The sheet-pan shape makes them practical, and the whole wheat gives them enough backbone to hold through freezing and reheating.

They are not meant to taste like health food punishment. They are meant to taste warm, steady, and useful.

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Recipe details

Timing & yield

Prep
15 minutes
Cook / bake
24 minutes
Total
39 minutes
Yield
15 squares

Ingredients

Dry ingredients

  • 2 cups whole wheat flour
  • 1 cup all-purpose flour
  • 1 cup old-fashioned oats
  • 3/4 cup brown sugar
  • 2 teaspoons baking powder
  • 1 teaspoon baking soda
  • 1 1/2 teaspoons cinnamon
  • 1 teaspoon kosher salt

Wet ingredients

  • 4 ripe bananas, mashed
  • 2 large eggs
  • 1 1/2 cups milk
  • 1/2 cup neutral oil
  • 2 teaspoons vanilla extract

Method

  1. Step 1. Heat the oven to 350 degrees Fahrenheit and grease a 10x15 rimmed pan or 9x13 baking dish.
  2. Step 2. In a large bowl, whisk together the whole wheat flour, all-purpose flour, oats, brown sugar, baking powder, baking soda, cinnamon, and salt.
  3. Step 3. In a second bowl, whisk the bananas, eggs, milk, oil, and vanilla until the bananas are mostly smooth and the mixture looks fully blended.
  4. Step 4. Pour the wet ingredients into the dry and fold just until no dry flour pockets remain; stop before the whole wheat batter gets tough.
  5. Step 5. Spread the batter evenly in the pan and smooth it into the corners so the center and edges bake at the same pace.
  6. Step 6. Bake for 22 to 24 minutes, until the center springs back lightly and a tester comes out with moist crumbs instead of wet batter.
  7. Step 7. Cool for 15 minutes before cutting so the squares hold together and do not crumble apart warm.

Equipment

  • mixing bowls
  • whisk
  • 10x15 rimmed pan or 9x13 baking dish

Storage & safety

Store covered at room temperature for 1 day or refrigerate for up to 4 days. Freeze cut squares for longer holding and thaw as needed.

Troubleshooting

The muffins baked up heavy
The batter was likely overmixed. Warm a square before serving and mix the next batch only until the flour disappears.
The whole wheat flavor feels too rough
Serve the squares with a little butter or yogurt, and next time let the batter sit 5 minutes before baking so the flour hydrates more fully.

Recipe rescue notes

The banana flavor got lost

Likely cause: The bananas were not ripe enough or the whole wheat flour muted them.

Fix: Spread a little peanut butter on the warm squares or serve with sliced banana to bring the fruit back forward.

Next time: Use deeply speckled bananas so the sweetness and aroma can carry the whole wheat flour.

Substitutions

Whole wheat flour
Use half white whole wheat flour for a softer flavor. — White whole wheat usually bakes a touch gentler while still giving the recipe more body than all-purpose alone.

Carryover / Next Meal Ideas

Banana breakfast parfait jars

Crumble a thawed square into yogurt with fruit for a quick school-morning breakfast that still feels intentional.

  • Warm the square briefly if it has firmed up in the refrigerator.

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