Line 8 holes of a muffin tin with 15 cm squares of greaseproof paper.
Heat the oil in a frying pan, add the spinach and cook briefly until wilted.
Remove from the heat.
Beat together the eggs, milk and cheese in a jug and season to taste, then stir in the chives and trout.
Divide the spinach between the muffin cases, then pour in the egg mixture.
Top each one with half a cherry tomato.
Bake in a preheated oven, 180°C (350°F), Gas Mark 4, for 12–15 minutes until just set.
Notes / Tips / Wine Advice:
For smoked trout baked eggs,
brush 4 ramekins with melted butter, then add 50 g flaked hot-smoked trout fillet to each dish. Carefully break 2 eggs into each ramekin, top with 2 tablespoons grated Cheddar cheese and season. Place the ramekins in a roasting tin with enough boiling water to come three-quarters of the way up the sides of the dishes. Bake in a preheated oven, 200°C (400°F), Gas Mark 6, for 8–9 minutes until the cheese has melted and the egg is cooked but still soft.Calories per serving 244