Preheat your oven to 375°F (190°C).

In a skillet, heat olive oil over medium heat and add diced sweet potato. Cook until tender, about 8 minutes.

In a bowl, whisk together eggs, milk, salt, and pepper.

Add cooked sweet potatoes, crumbled sausage, and blueberries to the egg mixture and stir to combine.

Pour the mixture into a greased oven-safe skillet and cook on the stove for 2-3 minutes until the edges start to set.

Transfer the skillet to the oven and bake for 20-25 minutes or until the frittata is set and lightly golden.

Allow to cool slightly, then slice and serve. Garnish with fresh herbs if desired.