Prep the Instant Pot and molds: Add 1 cup of water to the Instant Pot and place the trivet inside. Spray the egg bite molds with nonstick cooking spray.
Mix the meatballs: Combine ground beef, ground pork sausage, panko, Worcestershire sauce, eggs, salt, and pepper in a large bowl with clean hands.
Divide the blended meat mixture between the prepared molds. Cover each mold with tin foil and stack them on the trivet in the pot.
Cook: Set the Instant Pot for 35 minutes on high pressure. Once cooked, use quick release to let out the pressure.
Carefully lift out the molds using the trivet handles. Let the meatballs cool for 5 minutes before removing.
Serve: Serve warm, brushed with ketchup or with ketchup on the side for dipping.