Ingredients: 

• ½ cup butter
• 4 Tbsp unsweetened cocoa powder
• ¼ cup all-purpose flour
• ¾ cup white sugar
• 2 cups milk 

Steps: 

Melt butter in a skillet over medium heat. Add cocoa and flour; stir until a thick paste is formed. Stir in sugar and milk. Cook, stirring constantly, until thick.