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Costco Overnight Oats Meal Prep (5 Jars)

Prep five jars of overnight oats on Sunday using Costco's Kirkland rolled oats — grab one from the fridge each morning for a high-protein, no-cook breakfast that keeps you full until lunch.

Prep Time
10 min
Cook Time
0 min
Servings
5
Cost / Serving
$5.40

Quick Answer

Combine Kirkland rolled oats, milk, chia seeds, and toppings (banana-walnut, berry, peanut-butter-chocolate, apple-cinnamon, tropical) in five jars. Refrigerate overnight; grab one each morning. Five flavors, ten minutes of work, no cooking.

Overnight oats are the meal prep gift that keeps giving. Costco's Kirkland rolled oats come in a large container that lasts months, and five jars of overnight oats take about 10 minutes to put together Sunday night. In the morning you have a nutritious, filling breakfast waiting in the fridge — no cooking, no cleanup, no thinking. Customize each jar with different toppings so the week doesn't feel repetitive.

Instructions

  1. 1

    Set out 5 mason jars or airtight containers (16 oz size works well).

  2. 2

    To each jar, add: ½ cup rolled oats, ½ cup milk, ¼ cup Greek yogurt, 1 tablespoon chia seeds, 1 tablespoon honey, a splash of vanilla, and a pinch of salt.

  3. 3

    Stir each jar well until combined. The chia seeds need to be fully incorporated to prevent clumping.

  4. 4

    Seal jars and refrigerate overnight (minimum 4 hours, up to 5 days).

  5. 5

    In the morning, give each jar a stir. Add your toppings of choice right before eating — adding them ahead of time makes them soggy.

  6. 6

    Eat cold or microwave for 60–90 seconds if you prefer warm oats in the morning.

Frequently Asked Questions

How long do overnight oats last in the fridge?+
Up to 5 days. The oats continue to absorb liquid over time and get thicker — add a splash of milk and stir before eating on days 3–5. The flavor actually improves on day 2 as everything melds.
Do overnight oats have to be eaten cold?+
No. Microwave for 60–90 seconds if you prefer warm oats. Add a splash of milk before microwaving since the oats will have thickened overnight.
Why add chia seeds?+
Chia seeds absorb several times their weight in liquid, creating a thicker, pudding-like consistency. They also add omega-3 fatty acids, fiber, and protein. Costco's Kirkland chia seeds are one of the best values in the store.
Can I make overnight oats without Greek yogurt?+
Yes. Replace the yogurt with an extra ¼ cup of milk. The result will be slightly thinner and less tangy. For extra protein without yogurt, add a tablespoon of nut butter or a scoop of protein powder.

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