In the bowl of a mixer, beat butter and honey together until light and fluffy. Add egg, almond milk, melted chocolate, and vanilla. Beat for another minute.
Add flour, cocoa powder, baking soda, and salt. Mix until just combined.
Spread dough in prepared pan and bake at 350°F until a toothpick inserted comes out clean, about 15 to 20 minutes. Cool completely. Serve with powdered sugar or Chocolate Honey Glaze.