16ouncescrimini or white button mushroomshalved and/or quartered for uniform pieces
1large yellow onionsliced thin
4clovesgarlicminced
½teaspoonkosher saltadjust to taste
¼teaspoonfreshly ground black pepperadjust to taste
Instructions
In a large skillet over medium-high heat, warm 3 tablespoons of butter and the oil. When the butter has melted, add the mushrooms to the pan.
Toss to coat the mushrooms and spread in a layer across the pan. Cook for about 5 minutes, stirring just a few times, about every minute or two.
Add the onions and stir to combine. Cook for about 5 minutes longer, until the mushrooms have turned brown and the onions are translucent, stirring every minute or so.
In the final minute of cooking, add the remaining tablespoon of butter along with the garlic and toss to coat. Continue stirring and cooking until the butter has melted and the garlic is fragrant. Remove from the heat and season to taste with salt and pepper.