How much Adam's Extract Imitation butter flavoring should I use for replacing one tablespoon of butter?

What are you making? The answer might depend on that.

“Flavoring” and “extract” imply it is not a butter substitute and is condensed, with small amounts producing lots of flavor.

The first couple of Google hits suggesting using teaspoons, not tablespoons like actual butter.

H-E-B Grocery says ‘Try adding 1 tsp. to a packaged cake mix for extra flavor or 1 tsp. to water before adding one cup of rice.’

I am guessing here (I am not a baker and hope some bakers to chime in) that oil or shortening would replace butter at 1:1 ratios, with a little butter extract for the flavor.

I just sent this Q to @Kardamom.

Well, I’m a baker but the OP has to answer what they intend to do with it before a response can be given.