Butter Pecan Turtles

Preheat oven to 350°F.
In a mixing bowl, combine flour, 1 cup of the brown sugar, and 1/2 cup of the melted butter. Mix well and press into an ungreased 9x13-inch baking pan.
Sprinkle chopped pecans evenly over the crust.
In a saucepan over medium heat, combine the remaining 2/3 cup melted butter and 1/2 cup brown sugar. Cook, stirring constantly, for 1 minute. Pour evenly over pecans.
Bake for about 20 minutes, until bubbly.
Remove from oven, sprinkle chocolate chips over the hot bars, and let them melt. Spread chocolate to cover the surface.
Cool completely, then cut into squares. Makes about 48 squares.