In a stand mixer bowl, combine instant yeast, water, and sugar. Allow to rest for a few minutes.
Microwave the butter until melted completely.
Add the milk to the butter and stir to warm the milk.
Pour the milk and the butter into the mixer bowl.
Add the flour and sea salt.
Using the dough hook, turn the mixer on low and knead the dough for 6-8 minutes.
Remove the dough hook, shape the dough into a ball, cover with a towel and allow to rise for 1 hour.
Prepare the 13x9 glass baking dish by greasing it with butter.
Punch down the dough and portion into 15 equal balls.
Roll the balls to smooth them out and place them into the 13x9. Cover and allow to rest for 30 minutes.
Preheat the oven to 375℉.
After the second rise, bake the slider rolls for 25 minutes, or until the top and bottom of the bread is browned.
Remove the baking dish from the oven and place on a cooling rack.
Butter the top of each roll. Allow to rest for at least 1 hour before slicing.