Why do we eat cheese at our Passover Seder? Isn't it treyf (not kosher ) to mix milk and meat?

Because cheese is delicious, that's why. And with all this matzah, what else are we supposed to do?

As Jews in 2015/5775 we have the freedom to observe the traditional laws of kashrut as much or as little as we choose. With this cheese plate, we celebrate that freedom and put these giant matzah crackers to good use.

Baruch atah adonai eloheinu melech haolam shehakol nihyah bidvaro

haggadah Section: Shulchan Oreich