Preheat the oven to 180C / 350F and line a baking sheet with parchment pepper.
In a mixing bowl, cream butter and sugar until fluffy and light.
1 cup unsalted butter, 1 cup granulated sugar
Mix in flour, baking soda, milk powder and salt until well combined, then stir in the crushed cornflakes and chopped pecans.
1 ½ cups all-purpose flour, 1 teaspoon baking soda, ¼ teaspoon salt, 1 cup cornflakes, ½ cup pecans
Scoop about a tablespoon of batter and roll it into a ball. Place it on the baking sheet, then repeat until you have about 13-15 balls, depending on the size you prefer.
Bake for 8-10 minutes or until lightly browned, then let the cookies cool for 15 minutes, then serve.
Notes
I highly recommend measuring your ingredients well! Too much, too little; whichever will surely ruin your cookie's texture and taste.