Warm the milk in a sauce pot on the stove to 110-115 degrees Fahrenheit. It's super important to get the temperature just right. Too cold, and the yeast will not activate, too warm and it can ruin it.
In a bowl of the stand mixer gently whisk the milk, yeast, and sugar together
Let it sit for about 5 minutes. The yeast mixture will begin to foam.
Add in the salt, eggs, softened butter, and 5 & ½ cups of the flour.
On low speed with a dough hook, mix until it starts to come together.
While mixing, slowly add the remaining ½ cup of flour. Knead for about 5 minutes. See notes to tell when dough is done.
Take a large glass bowl and lightly coat it in olive oil.
Transfer the dough to the glass bowl, form into a ball, and cover it with a damp cloth for 90 minutes. It should have risen quite a bit and be super fluffy after the 90 minutes.
Before removing the dough, take two 9x13 pans and lightly coat them on the bottom and sides with cooking spray or olive oil.