I love steak, mushroom, onion, all of it! On a warm sandwich with some melty cheese and some delicious au jus to dip it in? Now you're speaking my love language! This Steak Melt was unreal! It was so delicious, dripping amazing juice, every bite bursting with flavor. Oh, and the smell while it's cooking? That beautiful herb butter! This sandwich was one of my favorite things I've ever made! It was incredibly difficult to stop eating it!
In a medium sized bowl, mash all herb butter ingredients together with a fork. Set aside until ready to use
To make the steak melt:
Preheat oven to 450 ℉.
In a large skillet, heat olive oil on medium. Add all other ingredients for the steak sandwich besides the cheese and baguette. Cook 5-7 minutes, until mushroom and onions are tender, and the steak is no longer pink.
Line a large baking sheet with foil for easy cleanup and place baguette halves on it.
Spread herb butter generously on both sides of the baguette and using a slotted spoon, carefully transfer steak mixture to the sandwich. Reserve those yummy steak juices in the skillet and set aside.
Next, evenly distribute the provolone slices along the steak sandwich and leaving the sandwich open, bake 8-10 mins.
To make the au jus:
Place your skillet with reserved meat juices back on medium heat, add in all other au jus ingredients.
Bring to a simmer, cook 5 minutes, whisking occasionally.
Serve Steak Melt sliced if desired, dipping it into that delicious au jus!