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1
Preheat oven to 350 degrees.
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2
Cook macaroni for half the time of the package instructions.
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3
Drain and set aside.
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4
Fry bacon until slightly, but not overly, crispy.
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5
Drain on a paper towel.
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6
Reserve grease.
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7
Melt 4 tablespoons butter in a skillet and then saute onions over medium-low heat for 10 to 12 minutes, or until golden brown and soft.
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8
Set aside.
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9
In a pot, melt 4 tablespoons butter (and add 1 tablespoon of the reserved bacon grease for good measure!).
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10
Sprinkle in flour and whisk to combine.
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11
Cook, stirring constantly, over medium heat for 1 minute.
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12
Pour in milk and half & half, then cook for 3 to 5 minutes or until thick.
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13
Reduce heat to low.
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14
Add salt & pepper to taste.
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15
(Do not undersalt!)
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16
Beat egg yolks and drizzle 1/4 cup hot mixture into the yolks, stirring constantly.
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17
Stir to combine.
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18
Pour egg mixture into sauce and cook for another minute.
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19
Add cheeses and stir until melted.
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20
Add onions and bacon and stir.
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21
Taste for seasonings and add more salt if needed.
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22
Add cooked macaroni and stir to coat.
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23
Pour into a baking dish and bake for 15 to 20 minutes or until sizzling and hot.
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24
Serve with red meat or a green salad.
