I don't usually do 100g portions for these, but below are some recipes that are super easy and delicious. I make each of these quite regularly, and make it a few times and you will be able to eyeball it so you don't have to precisely measure all the time.
1. 400g Carrots (full size peeled, or "baby carrots") tossed with 1tsp olive oil and black pepper, then roasted at 425F for 20 minutes is approximately two 100 calorie servings.
2. 400g Butternut squash (i use frozen - but thawed before roasting, so less of a PITA to prep) tossed with 1tsp olive oil, and 1 tsp of taco seasoning (store bought or home made). 425 for 20 minutes. Again, 2 servings of ~100 calories.
3. 400g of cauliflower tossed with 2 tsp of olive oil, 1/2 tsp of turmeric, 1/2 tsp of cumin. 425 for 1 hour, again, 2 servings of ~100 calories
4. 4 cups of cherry tomatoes (~100 calories), 2 English cucumbers (~80 calories), 200g of chickpeas (~320 calories), 1/2 tbsp olive oil (120 calories), 1 tbsp balsamic vinegar (14 calories), 6 servings of ~100 calories
5. 50g of sun-dried tomatoes (cut in strips), 100g of oil packed roasted red peppers (cut in strips, drained), medium avocado (cut into cubes), 50g of dried, unsweetened mango (diced) - 5 servings of ~110 calories)