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