Big Fat Chewy Chocolate Chips Cookies

My sister in law gave me this recipe and I love it!! I will not make choco chip cookies any other way!!

2 cups all purpose flour
1/2 teaspoon baking soda
1/2 teaspoon salt
3/4 cup unsalted butter, melted
1 cup packed brown sugar
1/2 cup white sugar
1 tablespoon vanilla
1 egg
1 egg yolk
2 cups semisweet choco chips

Preheat oven to 325. Grease cookie sheet. Sift together flour, baking soda, salt. In a medium bowl, cream together butter, brown sugar, white sugar until well blended. Beat in the vanilla, egg and egg yolk until light and creamy. Mix in sifted ingredients until just blended. Stir in choco chips with a wooden spoon. Drop cookie dough 1/4 cup at a time onto the prepared cookie sheets. Cookies should be about 3 inches apart. Bake for 15 to 17 minutes until the edges are lightly toasted. Cool on baking sheets for a few minutes before transferring to wire racks to cool completely.