Spray the bottom of a 6-quart electric pressure cooker (Instant Pot) with nonstick cooking spray or wipe with a bit of butter. Add baby potatoes into the bottom of the insert.
Pour chicken broth on top of potatoes. Stir in minced garlic.
Top potatoes with pats of butter. Place rack insert on top of Little Potatoes.
In a bowl, combine all the meatloaf ingredients. It really is best to use your (very clean!) hands to mix this up.
Place meatloaf mixture onto a sheet of nonstick aluminum foil. Shape the loaf into a rectangle and fold up the sides of the foil so it makes a little meatloaf boat.
In a small bowl, combine meatloaf glaze ingredients and stir well.
Spread half of this glaze mixture onto the meatloaf (we'll use the rest later). Place meatloaf on top of rack insert.
Place lid onto pressure cooker and lock it into place. Make sure the valve on the lid is turned to "Sealing".
Set to manual high pressure for 30 minutes. Note: If using a different pressure cooker, then you may need to increase the cooking time.
After it is done cooking, move the valve setting to "Venting" (this is called a quick release). Be VERY careful of the steam that will quickly come out.
Allow all of the steam to fully release before unlocking lid.
Optional: Using oven mitts, carefully remove your 'meatloaf boat' and place it on a baking sheet. Set your oven to "High" broil. Spread the rest of the meatloaf glaze on top of the cooked meatloaf. Then slide meatloaf under the broiler for a couple of minutes just until it starts to bubble.
Meanwhile, add Parmesan cheese to cooked potatoes in Instant Pot. Sprinkle with dried parsley (optional) and stir well.
Remove meatloaf from the oven. Carefully place meatloaf on a serving plate using a large spatula. Then, gently remove the insert from the Instant Pot (using oven mitts) and carefully drain any excess broth from the bottom. Spread Little Potatoes around meatloaf.
Updated to add: I tested this recipe using the Instant Pot brand pressure cooker. Some folks have suggested that the brands of pressure cookers they own are different from the Instant Pot and require more cooking time. So having said that, please use your judgement based on your knowledge of the electric pressure cooker that you own. You may need to add additional time to your cooking.