Boil high-protein noodles in salted water according to package instructions until al dente, then drain.
In a small bowl, whisk together gochujang, soy sauce, honey, and sesame oil to create the sauce base.
Heat avocado oil in a large non-stick skillet over medium-high heat.
Add diced chicken breast to the skillet and cook for 6-8 minutes until golden brown and the internal temperature reaches 165°F (74°C).
Add minced garlic and grated ginger to the chicken, sautéing for 60 seconds until fragrant.
Reduce heat to medium and add the cooked noodles and gochujang sauce to the skillet.
Toss all ingredients thoroughly for 2 minutes to ensure the sauce coats the noodles and chicken evenly.
Add baby spinach and stir until just wilted, approximately 1 minute.
Divide into bowls and garnish with sliced green onions and toasted sesame seeds.