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Rhubarb Oatmeal Cookies

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These Rhubarb Oatmeal Cookies are soft, chewy, and packed with tart rhubarb, hearty oats, warm cinnamon, and a hint of vanilla. The tangy rhubarb perfectly balances the sweetness of the cookie, while the oats add a satisfying texture. They’re ideal for breakfast on the go, an afternoon snack, or dessert with a cup of coffee or tea.

Recipe Overview

  • Prep Time: 20 minutes
  • Cook Time: 12–15 minutes
  • Total Time: 35 minutes
  • Yield: 24 cookies
  • Difficulty: Easy

Equipment

  • Large mixing bowl
  • Medium mixing bowl
  • Electric mixer or hand whisk
  • Measuring cups and spoons
  • Rubber spatula
  • Baking sheets
  • Parchment paper or silicone baking mat
  • Cooling rack

Ingredients

Dry Ingredients

  • 1¾ cups (220g) all-purpose flour
  • 1½ cups (135g) old-fashioned rolled oats
  • 1 teaspoon baking soda
  • ½ teaspoon baking powder
  • 1 teaspoon ground cinnamon
  • ¼ teaspoon ground nutmeg (optional)
  • ½ teaspoon salt

Wet Ingredients

  • ¾ cup (170g) unsalted butter, softened
  • ¾ cup (150g) light brown sugar, packed
  • ¼ cup (50g) granulated sugar
  • 1 large egg, room temperature
  • 1 teaspoon pure vanilla extract

Add-Ins

  • 1½ cups finely diced fresh rhubarb (about 2–3 stalks)
  • ½ cup chopped walnuts or pecans (optional)
  • ½ cup white chocolate chips (optional)
  • ¼ cup shredded unsweetened coconut (optional)

Ingredient Notes

Rhubarb

Use fresh, firm stalks with any leaves removed (rhubarb leaves are toxic and should never be eaten). Dice the stalks into small ¼-inch pieces so they bake evenly.

Oats

Old-fashioned rolled oats provide the best chewy texture. Quick oats can be used but will produce a softer cookie.

Butter

Softened butter creams more easily with the sugar, creating light and tender cookies.

Instructions

Step 1: Prepare the Oven

Preheat your oven to 350°F (175°C).

Line baking sheets with parchment paper or silicone baking mats.

Step 2: Mix the Dry Ingredients

In a medium bowl, whisk together:

  • Flour
  • Rolled oats
  • Baking soda
  • Baking powder
  • Cinnamon
  • Nutmeg (if using)
  • Salt

Set aside.

Step 3: Cream the Butter and Sugars

In a large bowl, beat the softened butter, brown sugar, and granulated sugar for 2–3 minutes, until light and fluffy.

Step 4: Add the Egg and Vanilla

Beat in the egg until fully incorporated.

Mix in the vanilla extract.

Step 5: Combine Wet and Dry Ingredients

Gradually add the dry ingredients to the butter mixture.

Mix just until combined. Avoid overmixing.

Step 6: Fold in the Rhubarb

Using a rubber spatula, gently fold in:

  • Diced rhubarb
  • Nuts (if using)
  • White chocolate chips (if using)
  • Coconut (if using)

The dough will be thick.

Step 7: Shape the Cookies

Scoop about 2 tablespoons of dough for each cookie and place them 2 inches apart on the prepared baking sheets.

Lightly flatten each mound with the back of a spoon.

Step 8: Bake

Bake for 12–15 minutes, or until:

  • The edges are lightly golden.
  • The centers are set but still soft.

Do not overbake, as the cookies will continue to firm up while cooling.

Step 9: Cool

Let the cookies cool on the baking sheet for 5 minutes.

Transfer to a wire rack to cool completely.

Serving Suggestions

Enjoy these cookies:

  • Warm with a glass of milk
  • With coffee or hot tea
  • As a lunchbox treat
  • Crumbled over vanilla yogurt
  • Alongside vanilla ice cream for dessert

Optional Variations

Strawberry Rhubarb Cookies

Add ½ cup finely diced fresh strawberries and reduce the rhubarb to 1 cup.

Ginger Spice

Mix in ½ teaspoon ground ginger for extra warmth.

Lemon Rhubarb

Add 1 tablespoon grated lemon zest for a bright citrus flavor.

Raisin Oatmeal

Replace the nuts with ½ cup raisins or dried cranberries.

Chocolate Lovers

Use dark or milk chocolate chips instead of white chocolate.

Tips for Success

  • Pat the diced rhubarb dry with paper towels if it’s very juicy to prevent excess moisture.
  • Chill the dough for 20–30 minutes if it feels too soft.
  • Use a cookie scoop for evenly sized cookies.
  • Don’t overmix once the flour is added, or the cookies may become tough.
  • Bake one tray at a time for the most even results.

Storage

Room Temperature

Store in an airtight container for up to 4 days.

Refrigerator

Keep in an airtight container for up to 1 week.

Freezer

Freeze baked cookies or unbaked cookie dough for up to 3 months.

Nutrition Information (Approximate Per Cookie)

  • Calories: 165
  • Protein: 3g
  • Fat: 7g
  • Carbohydrates: 23g
  • Fiber: 2g
  • Sugar: 11g
  • Sodium: 95mg

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