M&M's Cookie Bars

M&M's Cookie Bars is a easy French recipe that serves 8. 250 calories per serving. Recipe by Once Upon a Time Pastry on YouTube.

Prep: 31 min | Cook: 20 min | Total: 1 hr 6 min

Cost: $9.57 total, $1.20 per serving

Ingredients

  • 250 g Unsalted butter (Melt gently, let cool slightly)
  • 150 g White sugar
  • 150 g Brown sugar (cassonade)
  • 2 Eggs (At room temperature)
  • 10 ml Liquid vanilla extract (About 2 teaspoons)
  • 300 g All-purpose flour
  • 5 g Baking powder (About 1 teaspoon)
  • 2 g Baking soda (About ½ teaspoon)
  • 1 g Salt (A pinch)
  • 180 g M&M's (milk chocolate) (Coarsely crush; keep a few for decoration)
  • 150 g Dark chocolate chips

Instructions

  1. Melt the butter and sweeten it

    Melt the butter over low heat, then stir in the white sugar and brown sugar until the mixture is smooth.

    Time: PT5M

  2. Add the eggs and vanilla

    Add the eggs one at a time to the butter‑sugar mixture, add the vanilla extract and beat until fully incorporated.

    Time: PT2M

  3. Prepare the dry ingredients

    In a medium bowl, sift the flour with the baking powder, baking soda and add the pinch of salt.

    Time: PT3M

  4. Combine the two mixtures

    Fold the dry ingredients into the wet mixture gradually, mixing gently with a spatula until a smooth dough forms.

    Time: PT5M

  5. Crush the M&M's

    Coarsely chop the M&M's with a knife or lightly crush them with a rolling pin.

    Time: PT2M

  6. Fold in the M&M's and chocolate chips

    Add the crushed M&M's and chocolate chips to the dough, mixing gently to distribute evenly.

    Time: PT2M

  7. Pour the batter into the pan

    Butter a 20 × 20 cm pan or line it with parchment paper, then pour the batter and spread it evenly.

    Time: PT2M

  8. Bake

    Place the pan in a preheated 180°C oven and bake for 20 minutes, until the top is lightly golden.

    Time: PT20M

    Temperature: 180°C

  9. Cool and decorate

    Let the cake cool in the pan for 10 minutes, then turn it out onto a rack. Press the reserved M&M's onto the top for decoration.

    Time: PT10M

Nutrition Facts

Calories
250
Protein
3 g
Carbohydrates
32 g
Fat
12 g
Fiber
1 g

Dietary info: vegetarian, low-calorie

Allergens: gluten, dairy, eggs, soy

Last updated: April 6, 2026

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M&M's Cookie Bars

Recipe by Once Upon a Time Pastry

Soft and ultra-indulgent cookie bars dotted with pieces of M&M's and chocolate chips. Perfect for a snack or breakfast, these cookie bars are easy to make and yield about 40 cookies or 8 large bars.

EasyFrenchServes 8

Shop all ingredients on Amazon in one click • Printable PDF with shopping checklist

Source Video
31m
Prep
20m
Cook
10m
Cleanup
1h 1m
Total

Cost Breakdown

$9.57
Total cost
$1.20
Per serving

Critical Success Points

  • Melt the butter without overheating.
  • Crush the M&M's to medium‑sized pieces.
  • Do not exceed the 20‑minute bake time to keep the center soft.

Safety Warnings

  • Be careful with hot butter to avoid burns.
  • Wear kitchen gloves when handling the hot oven.

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