Step 1

Mix the flour and salt together in a bowl.

Step 2

In the following order, layer the sugar, cocoa powder, flour/salt mix and instant coffee in your jar as cleanly as possible.

Step 3

In the following order, layer the milk chocolate, Reese's and dark chocolate. Seal the jar.

Step 4

Attach a notecard with the ingredients in the jar listed, plus the extra ingredients needed, and the directions on how to make the brownies. Decorate the jars as desired.

Step 5

Preheat the oven to 350 degrees F. Lightly grease a 9x13 inch baking dish and line with parchment paper.

Step 6

Dump the contents of the jar out into a mixing bowl. Remove the Reese's, unwrap and chop into pieces. Add them back to mixing bowl.

Step 7

Add 2 sticks (16 tablespoons) melted butter, 2 tablespoons Kahlua (optional), 1 tablespoon vanilla and 4 eggs. Mix with a spatula until just combined. Spread the batter into the prepared baking dish.

Step 8

Bake for 40-50 minutes or until the brownies are just set. Allow to cool completely before cutting, about 2 hours. Dust with powdered sugar.