Bring 1 cup of water to a boil in a small saucepan, then whisk in the stone-ground grits.
Reduce heat to low, cover, and simmer for 15-20 minutes or until the grits are tender and the water is absorbed.
Stir the Greek yogurt and sea salt into the grits until smooth and creamy, then set aside.
While grits cook, heat olive oil in a medium skillet over medium-high heat.
Add the diced onion and red bell pepper to the skillet, sautéing for 3-4 minutes until softened.
Add the shrimp, minced garlic, and Cajun seasoning to the skillet, cooking for 2-3 minutes per side until the shrimp are pink and opaque.
Remove the skillet from heat and stir in the fresh lemon juice and black pepper.
Divide the creamy grits into bowls, top with the zesty Cajun shrimp mixture, and garnish with fresh parsley.