Passing Variables in API Post Request JSON Body

Ok. I figured it out. I had to use an annoying text combination:

let
    LOGIN = Text.Combine({"""",Login_Parameter,""""},""),
    PW = Text.Combine({"""",Login_Password,""""},""),
    body = "{
        	""UserName"":"&LOGIN&",
        	""Password"":"&PW&"
        }",

Just to reiterate, the parameters I setup are named Login_Parameter and Login_Password and formatted as Text. The result comes out as:

body = {
        	"UserName":"breticious",
        	"Password":"password123"
        }