Preheat the oven to 375 degrees. Place a 10" cast iron skillet in the oven to heat.
In a medium sized mixing bowl, whisk together the flour, 3 tablespoons of sugar, baking powder, salt & cinnamon- until evenly combined.
In a separate mixing bowl, whisk together the milk, egg, melted butter, and vanilla extract- until evenly combined.
Combine the wet/dry ingredients, whisking just until combined.
Carefully remove the hot skillet. Add the last pat of butter, swirling it around to coat the skillet evenly. Pour/scrape the batter into the pan, smoothing with a spatula.
Spread the fruit evenly out over the top, sprinkling with the remaining sugar.
Return the skillet to the oven, baking 25 minutes- or until golden brown and a toothpick in the center comes out clean. Remove the cooked pancake from the oven, and let rest for 5 full minutes, to set.
Dust the cake with sifted powdered sugar. Slice, and serve with a drizzle of honey or syrup.