Crispy Pan Noodles

In a large pot of boiling water, cook noodles to al dente, 3 to 4 minutes. Drain. In a large skillet over medium heat, add cooked noodles and stir until residual water is mostly evaporated, 2 to 3 minutes. Add bacon and cook, stirring occasionally, until fat is mostly rendered, 2 to 3 minutes. Add green onions and garlic and stir until fragrant and slightly softened, 2 minutes. Add pepper, red pepper flakes, cumin, fennel, paprika, and MSG (if using) and stir to toast spices, 1 minute. Reduce heat to low and continue cooking until noodles are golden and crispy, about 6 minutes. Top with squiggles of Sriracha and mayo and sprinkle with sesame seeds and more green onions before serving.