Preheat oven at 350-degrees. Line a 13x9 baking pan with aluminum foil and apply nonstick spray.
In a large bowl, cream together butter and brown sugar, followed by the eggs and vanilla.
In a separate bowl, sift together flour, baking powder, and salt. Gradually beat the dry ingredients into the butter mixture. Fold in the cinnamon chips.
Spread batter in the pan. Combine the topping ingredients and sprinkle them all across the top of the batter.
Bake for 20 to 25 minutes, until golden brown and the middle passes the toothpick test. Cool completely in pan on a wire rack.
To make the glaze, combine all three ingredients in a small bowl until smooth in texture. Drizzle over top of bars and let set for fifteen minutes.
Use foil to lift contents onto cutting board. Slice into bars. Store in an airtight container between layers of wax paper, either at room temperature or refrigerated.
OM NOM NOM!