Sauté on high. Add oil and butter, let it heat up.
Add chicken and cook completely, about 10 minutes.
Next, add onion and cook for 2-5 minutes.
Add garlic and cook for 1-2 minutes.
Next, add salt and pepper, stir well.
Add potatoes and frozen corn, and mix well.
Stir in flour well.
Add chicken stock and turn off the sauté.
Pressure cook on high for 3 minutes. Do a quick release.
Use a potato masher to leave bigger bits of chicken in the soup, or blend together for a smooth soup.
Add cream cheese and stir until melted.
Turn on the instant pot on high and add milk and cream.
Once the milk and cream start to boil, add shredded cheese and stir until fully melted.
Serve immediately topped with cheese.