Place the oil in the Instant Pot and select “Sauté”.
Add the chicken breasts and cook for about 4-5 minutes.
With a slotted spoon, transfer the lamb meat into a plate.
Add onions and cook for about 3 minutes.
Add garlic and cook for about 1 minute.
Select “Cancel” and stir in the cooked lamb and broth.
Secure the lid and cook under “Manual” and “High Pressure” for about 8 minutes.
Select the “Cancel” and carefully do a Quick release.
Dish out the lamb meat and keep aside.
In a small bowl, dissolve arrowroot starch in 1½ tablespoons of water.
Select “Sauté” and add arrowroot mixture, stirring continuously.
Add cheddar cheese and cream cheese and cook until melted completely, stirring continuously.
Meanwhile in a large microwave-safe bowl, add broccoli and 2 tablespoons of water and microwave on High for about 3-4 minutes.
Add lamb meat and broccoli in Instant Pot and stir well.
Simmer for about 4-5 minutes and serve hot.