Step 1

Preheat the oven to 350F then line an 8x8 inch baking pan with parchment paper.

Step 2

Mix the butter and brown sugar together on medium speed until combined.

Step 3

Add the egg and the vanilla extract and mix until combined.

Step 4

Mix in the flour and salt just until the flour disappears. You don't want to over-mix the brown butter blondie mix. Fold in the chopped-up chocolate and the M&m's.

Step 5

Spread the blondie mixture in the prepared 8X8 inch baking pan, top with extra m&m's and chopped chocolate, and bake for 25 minutes.

Step 6

Once baked, pull out the blondies from the oven and allow them to cool down fully before slicing into them. I let them cool for an hour or two depending on my kitchen's temperature. They should be at room temperature. This will allow the bars to be fully set. Slice into 16 equal squares and enjoy.