I would say this is one of those “emergency” quick meals but it’s definitely not a desperate sad meal. Cooking the spaghetti in the end with the sauce means it absorbs some of the mushroom flavor and gives an extra creamy feel because of the starch from the pasta. With just a slight kick from the mustard, this could even be sophisticated dinner party meal with totally minimal effort! Serve with big shavings of Parmesan cheese to impress!
Place the bacon in a large sauté pan and cook on medium high heat, until all the fat has been rendered out and the bacon is crispy. Remove bacon from the pan to a bowl lined with a paper towel. Pour the fat into a heatproof cup and set aside.
Do not wipe out the pan. Add the garlic and return the heat to medium high. Cook for 15 seconds or until the garlic starts to turn fragrant. Add the onions, mushrooms and 1 tablespoon of the reserve bacon fat. Cook until the onions are translucent and the mushrooms are tender (about 5 to 10 minutes).
While the mushrooms and onions are cooking, bring a large pot of heavily salted water to a boil.
Once the mushrooms and onions are done, add the chicken broth, cream and mustard to the pan. Bring to a boil, then reduce heat so it barely simmers. The large pot of salted water should be boiling now too.
Add the spaghetti to the salted water and cook for 5 minutes. Make sure the liquid in the mushroom pan is simmering as well for the same time. Stir both the pasta and the sauce occasionally.
Once the spaghetti has cooked for 5 minutes, grab the pasta with tongs or a spaghetti ladle from the hot water and move it to the mushroom pan. Continue to cook the pasta in the mushroom pan, stirring frequently. It will cook and absorb the liquid. Cook until the spaghetti is al dente firm (about another 4 to 5 minutes) and all of the liquid has been absorbed. Add the frozen peas and bacon and cook, stirring to incorporate, for an addition 30 seconds. Season with salt and pepper to taste.
Plate the pasta then sprinkle with the parsley and shave some Parmesan over the top of the pasta. Serve immediately.