In a large bowl, cream 1 cup butter and 1 cup brown sugar until light and fluffy, 5-7 minutes. Combine 2-1/2 cups oats and flour. Gradually add to creamed mixture until crumbly. Press into a greased 13x9-in. baking pan. Spread with cranberry sauce. , In a microwave-safe bowl, melt remaining butter; stir in the pecans and remaining brown sugar and oats. Sprinkle over cranberry sauce. Bake at 375° until lightly browned, 25-30 minutes. Cool on a wire rack. Cut into bars.