MELT butter in 13 x 9-inch baking pan in preheated 350° F. oven for 5 to 10 minutes.
STIR in sugar, flour, pecans, eggs, Choco Bake, vanilla extract and cinnamon with a fork until well blended. Smooth batter with spatula.
BAKE for 25 to 30 minutes or until wooden pick inserted in center comes out clean. Cool completely in pan on wire rack.