- Mix together starter, oil, sugar and water in the bowl of a stand mixer. 
- Add in flour and mix on low until a smooth dough forms. If adding inclusions, add up to 1/2 cup now. See notes below. 
- Knead in the stand mixer for 3-4 minutes. 
- Lightly oil the top of the dough and cover with plastic wrap. 
- Put the dough in the fridge for 12-18 hours. 
- Pull the dough out of the fridge and let it warm up on the counter for about an hour. 
- Shape dough into 16 equal sized pieces. 
- Preheat oven to 425 degrees. 
- Boil water in a large pot on the stove. Once the water is boiling, add 2 tablespoons of baking soda. 
- Using a slotted spoon, boil bagels for 20 seconds on each side working in batches of 2-3 at a time. 
- Place boiled bagels on a parchment lined baking sheet. 
- If adding toppings, brush each bagel with egg wash and sprinkle on toppings. 
- Bake at 425 for 25-28 minutes. Let the bagels cool COMPLETELY before cutting open. The bagels continue to bake on the inside until completely cooled. 
- Store leftovers in an air tight container or in the freezer for up to 3 months.