In a mixing bowl, combine the warm milk, active dry yeast, and brown sugar. Let it sit for about 5-10 minutes until it becomes frothy.
Add the melted salted butter and eggs to the yeast mixture. Whisk until well combined.
In another bowl, whisk together the all-purpose flour and salt. Gradually add the flour mixture to the wet ingredients, stirring until a soft dough forms.
Transfer the dough to a floured surface and knead for about 5-7 minutes until it is smooth and elastic.
Place the kneaded dough in a greased bowl, cover it with a clean kitchen towel, and let it rise in a warm place for about 1 hour, or until it doubles in size.
In a small bowl, mix together the brown sugar and cinnamon.
Once the dough has risen, punch it down and roll it out on a floured surface into a rectangle, about 1/4 inch thick.
Spread the blueberry jam evenly over the rolled-out dough, leaving a small border around the edges. Sprinkle the brown sugar and cinnamon mixture over the jam.
Starting from one long edge, carefully roll the dough into a tight log. Slice the log into 12 equal pieces and place them in a greased baking dish.
Cover the cinnamon rolls with a towel and let them rise again for about 30 minutes. Preheat your oven to 375°F (190°C) during this time.
Bake the rolls in the preheated oven for 20-25 minutes, or until they are golden brown and cooked through.
While the rolls are baking, whisk together the powdered sugar, maple syrup, and vanilla extract until smooth.
Once the rolls are out of the oven, drizzle the warm maple icing over the top. Finish with a sprinkle of flaky sea salt.