In a saucepan or in a 2 cup microwave-safe measuring cup, combine the milk and 2 tablespoons of butter. Heat until very warm (120 to 130 degrees). Put the milk mixture into the bowl of a stand mixer and stir in 1 cup of the flour, the salt, the yeast and the egg. Stir until well blended, then add the whole wheat flour.
Attach dough hook to the mixer and knead. Continue adding remaining all-purpose flour as needed until dough no longer sticks to the side of the bowl. Knead until mixture is smooth and elastic. Transfer dough to a greased bowl, cover and let stand in a warm place for about an hour or until doubled in size.
Grease a Bundt pan generously with butter and sprinkle with about 1 tablespoon of the sesame seeds and about 1 tablespoon of sunflower seeds Set aside.
Punch down the dough. Break dough into 40 walnut size chunks and arrange the chunks (as you break them) in the pan. After you’ve put about 20 chunks of dough in the pan, drizzle with 2 tablespoons of butter and sprinkle with ½ tablespoon each of seeds.. Add remaining dough pieces, then drizzle with remaining butter and sprinkle with remaining sesame seeds. Cover and let rise for an hour.
Preheat the oven to 375 degrees. Bake loaf for 30 to 40 minutes or until it sounds hollow when tapped. Invert onto a serving plate and let cool for about 10 minutes. Break apart while still warm