01 - Cook macaroni according to package directions until al dente. Drain thoroughly and set aside.
02 - In a large skillet over medium heat, cook chopped bacon until crispy, approximately 6–8 minutes. Remove with slotted spoon and drain on paper towels. Reserve 1 tablespoon bacon fat.
03 - In a large saucepan over medium heat, melt butter combined with reserved bacon fat. Whisk in flour and cook constantly for 1 minute to form a roux.
04 - Gradually whisk in milk until smooth. Bring to a simmer and cook 2–3 minutes until slightly thickened. Add cheddar, Parmesan, garlic powder, onion powder, salt, and pepper. Stir until cheese melts completely.
05 - Add cooked macaroni and half the bacon to the cheese sauce. Stir thoroughly to coat pasta evenly.
06 - Gently fold in diced avocado and lemon juice. Serve immediately topped with remaining bacon and fresh chives.