Spinach Maria Recipe

Ingredients

• 6 tbsp. butter, separated into 1 tbsp. and 5 tbsp.
• 1/2 yellow onion, diced
• 4 c. milk
• 2 tsp. garlic powder
• 1 tsp. crushed red pepper flakes
• 1 tsp. mustard powder
• 5 packages frozen spinach, thawed (50 ounces total)
• 5 tbsp. flour
• 1 c. Velveeta cheese, cut into slices
• 1 c. shredded sharp Cheddar cheese
• 1 1/2 c. grated Monterey Jack cheese, divided into 1/2 c. and 1 c.