If self-catering in Serre Chevalier why not try some of the takeaway options shown below?

LE MONETIER LES BAINS

La Brasera, near the Mairie/statue of a chamois – takeaway pizzas
Pizza Nono, on left after Bar L’Alpen direction Grenoble – takeaway pizzas
Pizza Mon’et, near Leclerc petrol station – takeaway pizzas

VILLENEUVE LA SALLE

Serre Che Pizza, Chemin de Loratoire Website

CHANTEMERLE

La Cabassa, Allée des Boutiques – takeaway pizzas
Le Marché Montagnard – mountain fayre for takeaway (raclette, fondue, pierrades) Website
Le Royal – takeaway panini, chips, pancakes, … Website
Pizza Mozza – pizza delivery and takeaway Website
Resto Thai – thai food takeaway

BRIANCON

Basilico – pizza, lasagne and other hot dishes (opposite Champ de Mars car park) 
La Tour De Pizz’ – pizza delivery (stone-oven baked pizzas) Website
Les Templiers – takeaway pizzas (and chips!) *
Mamma Mia – Italian pizzas to takeaway (opposite Champ de Mars car park)
Sushissime – sushi takeaway (located on the Place Centrale in Briançon city centre)

* located in the magnificent medieval (old walled town) of Briançon