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Melt the butter in a medium-sized saucepan over medium heat.
Once the butter is melted, add the flour all at once and stir to make a roux.
Once it is smooth and bubbly, slowly pour in the milk while stirring quickly or using a whisk to make a smooth sauce.
After sauce thickens, add the lemon juice, Dijon mustard, salt, paprika, and pepper. Bring the sauce barely to a boil. Pour over chicken, ham, and cheese.
Melt butter in microwave, mix in Panko and sprinkle over the casserole. Bake.
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