Pop both bags popcorn and pour in large container. Remove any un-popped kernerls

Mix m&m and pretzels

Melt butter in large saucepan and add marshmallows. Stir until melted

Mix popcorn, pretzels and m&m’s then pour melted marshmallow butter over and mix using 2 spatulas or large spoons

Press into Bundt pan and cover with aluminium foil. Leave to set at room temperature

Remove from pan and cut with sharp knife