Combine all the dry ingredients first in the large mixing bowl of a stand mixer or mixing bowl. Add the liquid ingredients and stir with a wooden spoon until they are fully combined (the dough will be tacky but not sticky). If it's sticky, add the right amount of flour a tablespoon at a time and mix until you get a smooth dough ball.
2 cups (282g) whole wheat bread flour, 1½ cups (212g) all-purpose flour, 2¼ teaspoons instant dry yeast, 1½ teaspoons salt, 1¾ cups warm water, 1 Tablespoon granulated sugar, 2 Tablespoons olive oil
Cover the bowl with a clean kitchen towel or plastic wrap and let the whole wheat loaf dough rise and double in size on the kitchen counter, approximately 3-4 hours. The dough is ready when it has visibly increased in volume and pressing a finger into the dough leaves a slight indentation that slowly fills back in.
After the first rise, gently deflate the dough by pressing it down with your fingertips. Transfer it to a lightly floured work surface and stretch the dough into a rectangle about ½ - 1 inch thick with even thickness. Fold both long sides into the center, then roll tightly from one short end like a burrito. Shape the dough into a smooth ball, seam side down and lightly dust the top with flour.
Transfer the dough, seam side up, to a floured banneton or a bowl lined with a well-floured kitchen towel. Cover loosely and let it rise for 45-60 minutes. The dough should look puffy and increase by about 50% in size.
Place a dutch oven with a lid in your oven and preheat the oven to 450°F. Transfer the dough to a piece of parchment paper, slice the top of the dough with a knife or a razor blade. Once the oven is preheated, carefully lower the dough (on the parchment) into the hot Dutch oven and cover. Bake the bread for 35-40 minutes, or until its crust is deep golden brown and sounds hollow when tapped on the bottom.
Let the bread cool completely on a wire rack for at least 1 hour before slicing.