In a large skillet or pan, heat the olive oil over medium heat.
Add the chopped onion and sauté for 2-3 minutes until it becomes translucent.
Stir in the minced garlic and cook for another 30 seconds.
Add the sliced mushrooms and cook for about 5 minutes until they release their moisture and start to brown.
Sprinkle the all-purpose flour over the mushroom mixture and stir well to coat the mushrooms.
Gradually pour in the vegetable broth and almond milk while stirring constantly to avoid lumps.
Add the dried thyme, dried rosemary, salt, and pepper. Stir until the mixture thickens, about 5-7 minutes.
Add the partially cooked potatoes, carrots, green beans, and frozen peas to the skillet. Mix everything together.