INGREDIENTS
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2 lb. Yukon gold potatoes (about 8), peeled, thinly sliced
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3 Tbsp. butter
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1 onion, cut lengthwise in half, then crosswise into thin slices
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2 Tbsp. flour
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1-3/4 cups milk
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4 cups loosely packed baby spinach leaves
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4 slices OSCAR MAYER Bacon, cooked, crumbled
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1-1/2 cups KRAFT Shredded Sharp Cheddar Cheese