1) Preheat oven to 350 degrees F.
2) In heavy saucepan, cook while stirring constantly with wooden spoon:
1/4 cup butter (salted is fine, or unsalted plus a pinch of salt)
14 ounces sweetened condensed milk
12 ounces semisweet chocolate chips
3) Remove from heat and stir in:
1 tsp pure vanilla extract
1 C all-purpose flour
1/2 cup pecans, chopped
4) Drop by teaspoonfuls onto ungreased baking sheets. Press a pecan half into the center of each cookie. (You should yield about 50 - 60 cookies, so you will need that many pecan halves). Bake for 7 minutes. (Do not overbake.) Remove cookies to wire racks to cool completely.
