Chocolate Lava Cake for Two (or one)

Bahan-bahan (2 porsi)

• 1 whole + 1 yolk large eggs ($0.32)
• 2 Tbsp white sugar ($0.02)
• 4 Tbsp butter (+ 1 tsp, $0.16)
• 1/3 cup semi-sweet chocolate ($0.50)
• 2 Tbsp flour (divided, $0.02)