Preheat oven to 350° F.
Line an 8 x 8 or 9 x 9-inch square pan with foil or parchment paper, leaving extra for “handles.”
Put all ingredients into a bowl.
Stir by hand until smooth (about 30 seconds).
Spread batter in pan and bake for about 20 minutes.
Cool in the pan for 5-10 minutes.
Lift out of pan and spread glaze over warm brownies.
Stir glaze ingredients together in a bowl, adding juice gradually until glaze is spreadable.
