Homemade multigrain bread - Le Coup de Grâce

Ingredients

• 1/4 cup spelt flakes
• 1/4 cup quick-cooking oatmeal flakes
• 1/4 cup whole-grain oats
• 1/4 cup quinoa
• 1/4 cup flax seeds
• 1/4 cup unshelled, unsalted sunflower seeds
• 1 3/4 cups boiling water
• 1 cup multigrain mix
• 3 tbsp (45 g) compact brown sugar
• 2 tsp (16 g) traditional active yeast
• 3 tbsp (45 ml) vegetable oil
• 2 cups unbleached bread flour (345 g)
• 1 1/3 cups (220 g) whole-wheat flour
• 3 tsp Fleischmann’s Bread Improver (16 g)
• https://www.iga.net/fr/produit/bonifiant-de-pain/00000_000000006421700031
• 1 1/2 tsp (16 g) salt
• All-purpose flour for work surfaces
• Original PAM-type cooking spray