Smoked Bacon And Souffle Frittata

Name: Smoked Bacon And Souffle Frittata
Ingredients: 400 g baby potatoes, peeled; 1 tablespoon olive oil by Sainsbury's; 1 red onion, finely chopped; 3 smoked back bacon rashers by Sainsbury's, chopped; 1 red pepper, deseeded and diced; 1 clove garlic, crushed; 2 plum tomatoes (about 200g), chopped; 4 large British free-range Woodland eggs by Sainsbury's, separated; 50 ml British semi-skimmed milk by Sainsbury's; 50 g mature British Cheddar by Sainsbury's, grated; ½ x 25g pack fresh chives, chopped; 100 g bag baby leaf spinach by Sainsbury's, ¼ roughly chopped and the rest left whole