Prepare Blueberries: Cook fresh or frozen blueberries over low heat for about 5-7 minutes until they release their juices.

Mix Starter: Combine lukewarm water, active dry yeast, and granulated sugar in a mixing bowl. Let it sit for 5-10 minutes until frothy.

Dough Mixing: Add bread flour, salt, blueberries, and vanilla extract to the yeast mixture. Mix until a thick, sticky dough forms.

Knead: Turn the dough onto a floured surface and knead for about 10 minutes until smooth and elastic.

First Rise: Place the dough in a lightly oiled bowl, cover, and let rise for 1 to 1.5 hours until doubled in size.

Shape Bagels: Punch down the dough, divide into eight pieces, and shape into bagels.

Second Rise: Cover shaped bagels and let them rest for about 30 minutes.

Boil: Bring water to a boil, add honey or brown sugar, and boil bagels for 1 minute on each side.

Bake: Preheat oven to 425°F (220°C) and bake bagels for approximately 20 minutes until golden brown.

Cool & Serve: Allow the bagels to cool on a wire rack for 30 minutes before serving with your favorite spread.