Prepare macaroni to al dente, according to package instructions. Drain and set aside.
In a small bowl, whisk the mayo, mustard, lemon juice, and garlic salt together.
Pour over macaroni and stir until everything is coated.
Add tomatoes, bacon, and green onion. Toss to incorporate.
INSTANT POT DIRECTIONS
Add pasta + 4.5 cups of water to the instant pot. Stir, cover and set to 'sealing'.. Cook on manual (high pressure) for 4 minutes. Do a careful quick release, pausing if it begins to sputter.
Drain pasta and rinse with cool water, continue with recipe as written above.
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Notes
Calories are automatically generated. For best results calculate based on your exact ingredients.