Beat butter and sugars at medium speed with an electric mixer until creamy. Add eggs and vanilla, beating well.
Combine flour, baking soda, and salt; add to butter mixture, mixing well. Stir in oats, morsels, and pecans. Drop by rounded tablespoonfuls unto ungreased baking sheets.
Baking at 350º for 9 minutes until golden. Cool slightly on baking sheets; transfer to wire racks to cool completely. Makes 5 dozen.