Sign In Users using Msal in Account Controller

I am converting some old .Net framework 4.8 code to .net 6. There is a lot of Adal code that I change to Msal but I can't determine what the signIn logic should look like inside our Account Controller. We are using the Microsoft.Owin logic below for Sign In.

HttpContext.GetOwinContext()
                        .Authentication.Challenge(new AuthenticationProperties { RedirectUri = "xxxx" },
                            OpenIdConnectAuthenticationDefaults.AuthenticationType);