In a large mixing bowl, cream butter and sugars until fluffy.
Add in egg and vanilla and mix well.
Stir in the flour and salt, and then add the mini Reese's Pieces.
Roll into balls and bake for 8-10 minutes or until edges are slightly turning golden.
Optional-you can chill the dough for 30 minutes to an hour, then bake. This will make a thicker cookie, but this step is not necessary!
Notes
*The original recipe calls for 2 cups of all purpose flour + 1 tsp baking soda. I use self rising flour instead for this recipe. * I also use slighly more flour than the recipe calls for, because I don't make drop cookies, instead I roll them into balls before baking. Just a 1/4 cup more flour usually makes them less sticky enough to roll. * The original recipe calls to bake right away without chilling the dough. I've done this both ways and both provide an excellent tasting cookie! But if you would like your cookies to be a bit thicker as pictured in this post, then chill the dough for at least 30 minutes or so before baking.