Whisk flour, steel cut oats, flax seeds, yeast, and salt in large bowl. Add water and vinegar. Using rubber spatula, fold mixture, scraping up dry flour from bottom of bowl until shaggy, sticky ball forms. Cover bowl with plastic wrap. Let dough rest at least 12 hours, preferably about 18, at warm room temperature, about 70 degrees.
Lay 12X18-inch sheet of parchment paper inside 10-inch skillet and spray with nonstick cooking spray. Dough is ready when its surface is dotted with bubbles. Transfer dough to lightly floured work surface and knead 10 to 15 times. Shape dough into ball by pulling edges into middle. Transfer dough, seam-side down, to parchment-lined skillet and spray surface of dough with nonstick cooking spray. Cover loosely with plastic wrap and let rise at room temperature until dough has doubled in size and does not readily spring back when poked with finger, about 2 hours.
About 30 minutes before baking, adjust oven rack to lowest position, place 6-8 quart heavy-bottomed Dutch oven (with lid) on rack, and heat oven to 475 degrees. Lightly flour top of dough and, using razor blade or sharp knife, make one 6-inch-long, 1/2 inch-deep slit along top of dough.
Carefully remove pot from oven and remove lid. Pick up dough by lifting parchment overhang and lower into pot (let any excess parchment hang over pot edge). Cover pot and place in oven. Reduce oven temperature to 425 degrees and bake covered for 30 minutes. Remove lid and continue to bake until loaf is deep brown and instant-read thermometer inserted into center registers 210 degrees, 20 to 30 minutes longer. Carefully remove bread from pot; transfer to wire rack and cool to room temperature before slicing.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	565.74 Kcal (2369 kJ)
Calories from fat	90.79 Kcal
		% Daily Value*
Total Fat	10.09g	16%
Sodium	891.31mg	37%
Potassium	338.66mg	7%
Total Carbs	100.18g	33%
Sugars	0.3g	1%
Dietary Fiber	9.33g	37%
Protein	18.79g	38%
Vitamin C	0.1mg	0%
Iron	139.5mg	775%
Calcium	75.8mg	8%

Amount Per 100 g
Calories	243.56 Kcal (1020 kJ)
Calories from fat	39.09 Kcal
		% Daily Value*
Total Fat	4.34g	16%
Sodium	383.73mg	37%
Potassium	145.8mg	7%
Total Carbs	43.13g	33%
Sugars	0.13g	1%
Dietary Fiber	4.02g	37%
Protein	8.09g	38%
Vitamin C	0.1mg	0%
Iron	60mg	775%
Calcium	32.7mg	8%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

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