01 -
Set oven to 350°F. Prep an 8x8-inch pan by lining it with parchment or spraying it with a nonstick spray.
02 -
Mix together flour, sugar, salt, cocoa powder, and baking soda in a large mixing bowl until everything looks even.
03 -
Throw in the water, vegetable oil, vinegar, and vanilla. Stir until the mixture is smooth and no lumps remain.
04 -
Pour the wet batter into the prepared dish. Bake for 30 to 35 minutes. Check with a toothpick, and if it comes out with a few sticky crumbs, it's done. Cool completely.
05 -
Using a hand mixer, blend the softened butter with the cocoa powder, honey, vanilla, and powdered sugar for about 30 seconds on low speed.
06 -
Slowly add the milk one tablespoon at a time, mixing until it’s the consistency you want. Spread this on the cake when it’s completely cooled.