Begin by preparing the sauce: In a small mixing bowl, whisk together the soy sauce, sugar, sesame oil, ground ginger, and Sriracha. Set this aside for later use.
Bring a large pot of water to a rolling boil. Add the lo mein egg noodles and cook them according to the package instructions. Once done, drain the noodles thoroughly.
Meanwhile, heat the olive oil in a large cast iron skillet over medium-high heat. Once the oil is hot, add the minced garlic, followed by the sliced mushrooms, julienned red bell pepper, and carrot. Sauté these vegetables, stirring often, until they become tender—this should take approximately 3-4 minutes.
Next, add the snow peas and baby spinach to the skillet. Cook until the spinach wilts, which will take about 2-3 minutes.
Finally, incorporate the cooked egg noodles and the pre-made sauce into the skillet. Gently toss all the ingredients together until well combined and the noodles are evenly coated with the sauce.
Serve immediately, enjoying the fresh and vibrant flavors of this dish.