Hi Beth and welcome! I found the following information that might be of help in regards to hypoglycemia and diet:
It really isn't that hard to increase calories as a vegan. I had to put on over twenty lbs to get healthy as a vegan due to other health conditions. Here are some ideas that helped me:
I would make homemade bread and use whole wheat flour and add ground flaxseed and/or sesame seeds to my dough. I would also slice it thicker than a store bought bread. If you buy bread, there are vegan breads that are more calorific. I like Rudi's organic vegan breads:
Now, you can add stuff to your slices of bread, and one way to increase nutrient density, protein, and calories all at once is to puree beans to make a dip you can spread on your bread. This is a great breakfast! Hummus is an easy example of a bean dip that can be spread on slices of bread/toast. I like to make a lemon/white bean dip, or kidney bean salsa type of dip. You can get in a larger serving of beans by pureeing them and adding stuff like tahini, or a little olive oil, or cooked carrot and so on into your bean dip. I have also had just plain whole beans on toast and that is great too but will be more filling with less beans so you don't get as many calories.
Speaking of pureeing beans, have you ever made split pea soup? This is a rich, high protein, calorie dense soup. I simply saute some onion, carrot, lemon juice, veggie broth in a large soup pan, then add a cup or so of dried split peas, and add four cups of water and/or vegetable broth. Simmer for a half hour or so until the beans are soft, then puree the soup in batches in a blender for a thick creamy filling soup. And have some bread on the side.
Avocado is great in salads or sliced in sandwiches, and if you have ever made avocado pesto, try that rubbed in some whole wheat pasta or spaghetti or if you don't eat gluten or pasta, rub it into another whole grain like millet, or quinoa.
Even a garden salad can be made heavier by adding avocado, whole olives, seeds (sunflower for instance), nuts, and nut butter dressings. Almond and peanut butter were my best friends when I needed to put on weight. For a quick and easy snack, especially while out hiking, I would slather a whole wheat tortilla with almond butter or peanut butter and fold it in half. Adding raisins to it was even better.
Another favorite...blend firm tofu with a banana or two, some pure cocoa powder, and a splash of plant milk. I add a pinch of salt and a little stevia (doesn't increase blood sugar) also, and it makes a nice rich pudding and very high protein and high calcium if you use a calcium set tofu.
Energy bars are great too. I make a dozen and freeze them and then just take out one when I need it and they take very little time to thaw. Some are downright awesome right out of the freezer. I like to follow this recipe formula:
Often it is really a matter of just experimenting with vegan recipes. I can think of tons of them that are higher calorie and filling. How about these?:
I think a key is to make food in batches and freeze it so you always have stuff on hand and aren't always cooking. If I make bread I make two loaves at a time.
A crockpot is great too, especially for making a large batch of steel cut oats or millet or brown rice (and add ins like coconut or nuts/seeds or plant milk or sliced apples and spices etc). It's as easy as throwing in some grain, add ins, and liquid and turning on the crockpot and going to bed. Seven or eight hours later when you are ready to eat breakfast you have a nice hot batch of food waiting. Stews and chili are great for this too! Make it overnight and then let it cool and store it in the refrigerator or freezer. I do this for a week's worth of lunches and store it in the refrigerator and I have it on hand for a whole week (keeps that long).
Also, drink higher calorie full fat plant milks like almond or soy milk in the 120 calorie per cup range. Or make your own plant milk and make it more dense. I have made homemade flaxseed, sesame seed, almond milk, rice milk, and oat milk. You can leave out the sugar or add just a smaller amount of it too.
If you are pinched for time, there are commercial vegan foods that work, such as cliff or larabars that are more calorific and filling as a snack. Or veggie burgers like Bocca, Gardein etc. Or try an Amy's vegan burrito from the frozen section (they even carry gluten free vegan ones too!).
when I was putting on weight, I had to be more open and flexible with allowing for occasional processed vegan foods and not be so strict with my diet as far as sticking only to "whole foods". the foods I mentioned above were helpful when I didn't feel like cooking or was on the trail or traveling. They can also help with increasing protein. There is no need to rely on expensive protein powders all the time. You can also add stuff like chia seeds, nut butters, chickpeas, and other higher protein and/or fat foods to smoothies.
One more favorite lol. If you soak raw grains like buckwheat groats or steel cut oats or oat groats or even millet for about eight to twelve hours (ie overnight), you can blend them into a puree and add fresh fruit to the blender as well and have a raw porridge for breakfast. Raw soaked grains are more calorific per cup than say cooked oatmeal which is made up of mostly water. The volume is less but the density greater so you get more calories, more protein, more nutrients for the same cup of cereal. And whole grains don't tend to increase blood sugar the way white flour and bread or processed sugared cereals do.
Here are a few examples of raw porridge:
I hope this helps.