Cook the high-protein pasta in a large pot of salted boiling water according to package directions until al dente. Drain and set aside.
Heat olive oil in a large non-stick skillet over medium-high heat.
Season chicken strips with 1 tablespoon of fajita seasoning and add to the skillet. Cook for 5-7 minutes until golden brown and cooked through. Remove chicken from the pan and set aside.
Add bell peppers and onions to the same skillet. Sauté for 5 minutes until vegetables are tender-crisp with slight charring.
Lower heat to low. Add chicken broth and the remaining 1 tablespoon of fajita seasoning to the skillet, scraping the bottom to deglaze.
Whisk in the Greek yogurt and lime juice until a smooth, creamy sauce forms. Do not allow the sauce to boil to prevent curdling.
Return the cooked chicken and pasta to the skillet. Toss thoroughly to coat all ingredients in the sauce.
Garnish with fresh cilantro and serve immediately.