I like a crispy crust baguette, baked the same day and not sliced.  I fillet it much like you have and use pats of Costco unsalted butter.  I no longer mince my own garlic as I get that from Costco too.  After the butter I sprinkle on Kinders garlic butter seasoning, then garlic, then finally Italian herbs which I suspect is mostly oregano and basil.  That's left open face on a pan, in the 400° oven for 5-6 minutes.