How to Make It
Make the meat loaf: Heat a large nonstick skillet over medium-high heat. Add oil to pan; swirl to coat. Add onion and chile; cook, stirring constantly, 4 minutes or until onion is tender. Add garlic; cook, stirring constantly, 1 minute. Cool slightly.
Combine onion mixture, oats, and next 10 ingredients (through egg). Shape meat mixture into a 7 x 41/2–inch loaf. Place in the inner pot of a 6-quart Instant Pot®.
Make the chili sauce: Combine all ingredients in a blender; process until smooth. Pour sauce over meat loaf in cooker. Close and lock the lid of the Instant Pot®. Turn the steam release handle to "Venting" position. Press [Slow Cook], and use [Adjust] to select "Less" mode. Press [-] or [+] to choose 6 hours cook time. Serve garnished with oregano leaves and chives, if desired.