Preheat oven to 350°F
In a medium mixing bowl, whisk together flour, salt, and baking soda, and set aside.
In a larger mixing bowl, cream together the unsalted butter and cannabis butter and the eggs until light and fluffy. Then, add the eggs one at a time and the vanilla extract, Greek yogurt, and milk.
Gradually add the dry ingredients to the wet ingredients and mix until just combined.
Fill each muffin cup to 1/3 full, and add 1 teaspoon of Nutella. Then, divide the rest of the batter evenly into all 12 cups and top each one with another teaspoon of Nutella. Using a skewer or chopstick, gently swirl the Nutella into each muffin.
Bake for 20-25 minutes, or until the tops begin to turn golden brown.