1. Heat oven to 350°F. Lightly grease cookie sheet or line with parchment paper.
2. Beat butter, brown sugar, lemon peel and vanilla extract in large bowl until light and fluffy. Add eggs; beat well. Stir together flour, baking soda and salt; add to butter mixture. Stir in white chips and pecans, if desired. Drop by tablespoons onto prepared cookie sheet.
3. Bake 8 to 10 minutes or until almost set. Cool slightly; remove from cookie sheet to wire rack. Cool completely. Makes about 30 cookies.