Preheat a large skillet over medium heat (I like to use cast iron for this). Add the oil to the pan, then add the green beans and season with a pinch of salt and pepper. Stir frequently for 3-4 minutes.
Next, add the sliced mushrooms and the chopped garlic to the pan. Give it all a good stir to combine. Then cook it for another 4-5 minutes, stirring occasionally.
When the green beans are tender-crisp and the mushrooms have turned slightly brown, season with another pinch of salt and pepper.
Transfer the veggies to a serving platter and top with the sliced almonds.