Pan Chocolate Chip Cookies

2 1/4 cups flour
1 teaspoon baking soda
1 teaspoon salt
3/4 cup butter, softened
3/4 cup sugar
3/4 cup brown sugar
1 teaspoon vanilla
2 eggs
1 12-ounce bag chocolate chips

Combine flour, soda and salt. Set aside. Combine butter and sugars, mixing well. Add vanilla and eggs, beating well after each egg. Add dry ingredients and mix well. Stir in chocolate chips. Spread mixture in a 10" x 15" sheet pan (slightly greased). Bake at 375 for 20 minutes.