Melt butter and brown sugar in microwave until sugar is dissolved (approximately 1 to 2 minutes on high power). Pour butter/sugar mixture over graham crackers to coat them. Sprinkle chopped pecans evenly over top.

Bake in 350 degree oven for 10 to 12 minutes. Cool to lukewarm and cut with knife into rectangles (yielding 48 bars) or when completely cooled break it as brittle is broken. Fast easy cookie that nut lovers enjoy!