Preheat oven to 375F degrees and grease a large baking sheet or line with parchment paper.
Mix together the flour, baking soda, salt and cornstarch in a medium sized bowl and set aside.
Beat together the softened butter, brown sugar, granulated sugar and vanilla until creamy.
Mix the egg into the butter mixture until light and fluffy.
Stir the flour mixture slowly into the butter mixture until well mixed.
Stir the chocolate chips and chopped Snickers into the mixture.
Drop rounded tablespoons of the batter onto the prepared baking sheet.
Bake in the oven for 8-10 minutes or until the cookies are a light golden brown.
Transfer cookies to a wire rack to cool.
Serve immediately or store in an airtight container until ready to serve, enjoy!
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Notes
Scoop your flour into the measuring cups and level off with a knife to prevent too much flour being used.To get a thicker cookie shape the dough balls to be a bit taller.To get that perfect circle cookie when they come out of the oven use a glass or biscuit cutter that's bigger than the cookie place it over each cookie and rotate in a circle. It will shape the cookie to be a perfect circle but it needs to be done when they are just out of the oven and hot. Then place a few extra chocolate chips into the cookie top.Store leftovers in an airtight container at room temperature for up to 1-3 weeks or in the refrigerator in an airtight container for up to 1-2 months.Dough balls can also be frozen for up to 3 months. Let them thaw for about 20 minutes then bake.