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Export 5 ingredients for grocery delivery
Step 1
Heat the oven to 350 degrees and line 2 large sheet pans with parchment.
Step 2
In a large bowl, whisk together the butter, sugars, egg, vanilla and salt by hand until smooth and fluffy, at least 1 minute. Whisk in the baking soda, then switch to a rubber spatula. Add the flour, then carefully and coarsely chop the M&M's, and add them, too. Gently stir to combine. Place the bowl in the refrigerator while you wait for the oven to finish heating.
Step 3
Using two spoons or a cookie scoop, plop out 2-tablespoon/50-gram rounds spaced a couple of inches apart on the sheet pans. (You should get about 8 cookies per pan.) Bake until lightly golden at the edges, 10 to 12 minutes. Let cool completely on the sheet pan; they will continue to cook as they sit.