Slow Cooker Cinnamon Roll Bread Pudding

Ingredients:

Serves six
— 100 grams (approximately 1/2 cup) slightly softened unsalted butter, plus a little more for greasing
— 110 grams (approximately 1/2 cup) caster sugar
— 1 Tablespoon ground cinnamon
— 8 brioche rolls, or 1 medium brioche loaf (around 280 grams or 10 ounces)
— 2 eggs
— 3/4 cup milk

For the glaze:
— 1/2 cup powdered sugar
— 2 Tablespoons milk