In a small saucepan combine brown sugar, honey, butter, and peanut butter. Bring to boil over medium heat, stirring constantly; reduce heat, simmer for 2 minutes. Remove from heat.
In a large bowl stir together granola, sunflower kernels, peanut, almonds and peanut butter pieces. Add brown sugar mixture to granola mixture; toss to combine. Immediately press granola mixture evenly into the prepared pan. Chill about 15 minutes or until firm.
Use foil to lift uncut bars out of pan. Place on a cutting board; cut into 8×1-inch bars. Transfer bars to a sheet of waxed paper. Drizzle with melted chocolate. Let stand about 15 minutes or until chocolate is set.
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