Concatenating name columns

I’m using sql server.

I have a table that has a lastname,firstname and middleinitial columns.
They are these datatypes:

[LastName] VARCHAR(30)
[FirstName] VARCHAR(20)
[MidInit] VARCHAR(1)

So when I run this query

SELECT [LastName],[FirstName],[MidInit]
FROM [Emplyoees]

I get this:

LastName FirstName MidInit
Simpson    Homer       J
Simpson    Lisa            M
Bunny        Bugs
Bonney      William      H

I would like to create a column called FullName that displays the data in this format LastName, FirstName MidInit

So then the new column would like like this:

FullName
Simpson, Homer J
Simpson, Lisa M
Bunny, Bugs
Bonney, William H

What’s the beat syntax to create this column?

Notice how bugs bunny has no MidInit.
When employee has no MidInit don’t place any character in the string for the middleinit.