Homemade Cinnamon Bun Monkey Bread with Cinnamon Caramel

Name: Homemade Cinnamon Bun Monkey Bread with Cinnamon Caramel
Ingredients: 1 egg (medium); 50g (3½ tbs) butter (chopped into small pieces); 250ml (1 cup) milk; 450-500g (3¾ - 4 cups) spelt flour (see note 1); 1 tsp cinnamon; ¼ tsp nutmeg; 2 tbsp brown sugar; 1 tsp salt; 7g (2¼ tsp) yeast (see note 2); 50g (3½ tbs) butter (very soft); 90g (½ cup) brown sugar; 1 tbsp cinnamon; 50g (¼ cup) brown sugar; 30g (2 tbsp) butter; 1 tbsp milk; 2 tbsp milk; 1 tsp vanilla; icing / confectioners' / powdered sugar (as much as needed)