Idahoan makes an instant mashed potato that tastes homemade, especially if used as a crust for shepherd's pie.
A Totino's frozen pizza (or {"peetzee") as we like to call it) can serve as the base for all kinds of great toppings, when we don't want to get a "real" pizza.
A bag of frozen mixed vegetables is a staple in my freezer. I use them in soups, stews, and casseroles, anything that needs those kinds of veggies.

White Clam Sauce
Serves 4 to 6
2 - 6.5 oz. cans of chopped clams
3 cups basic white sauce, homemade or packaged
2 tbsp. extra virgin olive oil
2 tbsp. butter
3 tbsp. finely diced sweet onion
4 medium button mushrooms, sliced (or 1 can sliced mushrooms, drained)
1 tsp. minced parsley
½ tsp. garlic powder
Drain clams, reserving liquid. Make white sauce, using the clam nectar for a portion of the liquid, adding milk or half-and-half to make 3 cups. Set aside and keep warm.
In a heavy saucepan, heat oil and butter over medium heat. Add onion. Cook slowly, stirring frequently until translucent. Add mushrooms and reduce heat to low. Add parsley and garlic powder. Continue cooking, stirring occasionally until mushrooms are tender, about 10 minutes. Stir in the white sauce, followed by the clams.
Simmer on low, 15 to 30 minutes, stirring occasionally. Serve over your choice of pasta, garnished with parmesan if desired.