In a small pot, bring the chicken bone broth to a boil over medium-high heat.
Slowly whisk in the stone-ground grits and a pinch of sea salt, then reduce heat to low, cover, and simmer for 15-20 minutes until tender.
While the grits cook, toss the peeled and deveined shrimp in a bowl with the Cajun seasoning, sea salt, and black pepper until well coated.
Heat the olive oil in a large skillet over medium-high heat.
Add the diced yellow onion, bell pepper, and celery to the skillet, sautéing for 4-5 minutes until the vegetables have softened.
Stir in the minced garlic and cook for 30 seconds until fragrant.
Add the seasoned shrimp to the skillet and cook for 2-3 minutes per side until they are pink and opaque.
Once the grits are fully cooked, remove the pot from the heat and stir in the plain Greek yogurt until the mixture is completely smooth and creamy.
Portion the creamy grits into a shallow bowl and top with the sautéed Cajun shrimp and vegetable mixture.
Garnish with freshly chopped parsley and serve immediately.