Pesto Mac dan Keju Krim dengan Bayam

Bahan-bahan (6 porsi)

• 2 cups uncooked macaroni ($0.50)
• 2 Tbsp butter ($0.22)
• 2 Tbsp all-purpose flour ($0.02)
• 2 cups whole milk ($0.60)
• 1/2 cup grated Parmesan ($0.53)
• 1/4 cup basil pesto ($0.55)
• 1/2 tsp salt ($0.02)
• Freshly cracked pepper ($0.03)
• 1/2 lb . frozen spinach ($0.80)