Follow these easy steps to make your Blueberry Lemon Dutch Baby:

1. Preheat Oven: Begin by preheating your oven to 425°F (220°C).
2. Melt Butter: In a 10-inch cast-iron skillet, place the butter and put it in the oven to melt as it preheats.
3. Mix Ingredients: In a mixing bowl, whisk together the flour, milk, eggs, granulated sugar, vanilla extract, lemon zest, lemon juice, and salt until smooth.
4. Add Blueberries: Gently fold in the fresh blueberries, being careful not to crush them.
5. Pour Batter: Once the butter is melted and bubbling, carefully remove the skillet from the oven and pour the batter into the skillet.
6. Bake: Place the skillet back in the oven and bake the Dutch baby for 20-25 minutes, or until it is puffed and golden brown.
7. Cool Slightly: Once done, remove the skillet from the oven and allow it to cool slightly.
8. Dust with Sugar: If desired, dust the top with powdered sugar for added sweetness and garnish with lemon slices.
9. Serve Immediately: Cut into wedges and serve while warm for the best taste.

These simple yet effective steps will help you create a delicious Blueberry Lemon Dutch Baby that is sure to impress.