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1
Preheat oven to 350 degrees F (175 degrees C). Grease a 2 1/2- or 3-quart baking dish.
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2
Bring a large pot of lightly salted water to a boil. Cook elbow macaroni in the boiling water, stirring occasionally until tender yet firm to the bite, 8 minutes. Drain. Return pasta to pot; cover. Keep warm off heat.
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3
Place bacon in a large skillet and cook over medium-high heat, turning occasionally, until evenly browned and crisp, about 10 minutes. Drain bacon slices on paper towels. Crumble.
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4
Puree milk, heavy cream, cumin, salt, pepper, and chipotle pepper in a blender or food processor. Pulse until the pepper is completely incorporated into the mixture, 8 to 10 pulses.
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5
Place butter and minced garlic in a saucepan over medium-high heat; stir until butter is melted. Whisk flour into butter mixture, and continue whisking until flour starts to turn golden brown, about 1 minute. Slowly add pureed milk and chipotle mixture to the saucepan, whisking until there are no more lumps. Bring to a boil, stirring frequently. Reduce heat to medium.
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6
Stir Cheddar and Monterey Jack cheeses into the cream mixture, stirring until the cheese is melted. Add roasted garlic sauce and mix thoroughly. Transfer mixture to pot with cooked pasta; stir. Pour into prepared baking dish.
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7
Bake in preheated oven until bubbly, about 20 minutes.
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8
Remove from the oven. Stir in crumbled bacon and chopped bell pepper. Bake until lightly browned, about 10 more minutes. Garnish with chopped parsley.
