Preheat your oven to 425°F (220°C). This high temperature will help get those pancakes perfectly fluffy and golden.
Line your sheet pan with parchment paper for easy removal and cleanup. You can also lightly grease the pan with a bit of vegetable oil.
In a large mixing bowl, whisk together the flour, baking powder, sugar, and salt until well combined.
In another bowl, whisk the egg, milk, heavy cream, and vegetable oil until smooth and well mixed.
Pour the wet mixture into the dry ingredients and stir until just combined. Be careful not to overmix; a few lumps are perfectly fine.
Gently fold in the blueberries, taking care not to break them up too much.
Pour the pancake batter into the prepared sheet pan, spreading it evenly.
Place the pan in the preheated oven and bake for 20-25 minutes, or until the edges are golden and a toothpick inserted in the center comes out clean.
Allow the pancakes to cool for a few minutes. Cut them into squares, serve warm with additional blueberries, and drizzle with maple syrup if desired.