Slow Cooker Overnight Savory Mediterranean Porridge with Tempeh

This overnight savory porridge packs 26 grams of plant-based protein and 10 grams of fiber into every bowl, with just 371 calories per serving. The combination of steel-cut oats and red lentils creates a creamy, nutrient-dense base, while crumbled tempeh adds substantial soy protein that holds up through hours of slow cooking. Each serving also delivers iron from the lentils and B-vitamins from the nutritional yeast stirred in at the end — nutrients that plant-based eaters on GLP-1 medications need to prioritize.

The flavor profile is distinctly Mediterranean. Earthy red lentils and nutty oats meet the concentrated sweetness of sun-dried tomatoes and the smoky depth of roasted red peppers. Kalamata olives add small pops of briny contrast, while dried oregano and garlic infuse the entire porridge with warmth. A handful of baby spinach stirred in each morning and a squeeze of fresh lemon brighten the bowl just before serving.

Overnight slow cooking means this breakfast is ready the moment you wake up — essential when morning appetite is unpredictable on GLP-1 medication. The porridge consistency is inherently gentle on digestion, and each serving is compact enough for reduced appetites while still meeting serious protein goals. Leftovers refrigerate beautifully, so a single batch covers four mornings with zero effort.

Why This Works on GLP-1

Each serving delivers approximately 26 grams of complete protein from three complementary plant sources: tempeh (fermented whole soybeans), red lentils, and steel-cut oats. This matters significantly for people on medications like Mounjaro or Wegovy, where rapid weight loss can include muscle mass if protein intake falls short. Research consistently shows that consuming 25 to 30 grams of protein at breakfast helps preserve lean tissue and supports satiety throughout the morning. By combining legumes and whole grains, this porridge provides all essential amino acids without any animal products.

The 10 grams of fiber per serving come primarily from the oats, lentils, and tempeh — all sources of soluble fiber that form a gentle gel in the digestive tract. This slow-moving fiber works synergistically with GLP-1 medications that already slow gastric emptying, extending fullness without the bloating that raw vegetables or high-inulin foods sometimes cause. The porridge texture itself is partially broken down through long cooking, making it even easier to digest than these same ingredients prepared quickly.

At 371 calories, this breakfast sits in the practical sweet spot for GLP-1 users who need adequate nutrition without overwhelming a suppressed appetite. The fat content stays moderate at 10 grams per serving — enough to support nutrient absorption and satiety without the heaviness of oil-rich dishes. Nutritional yeast adds B12, a vitamin that plant-based eaters need to supplement and that some people on GLP-1 medications risk falling short on through reduced overall food intake.

Ingredients (serves 4)

For the overnight porridge:

• 3/4 cup (117g) steel-cut oats (not rolled or instant)
• 1/2 cup (96g) dried red lentils, rinsed
• 8 oz (225g) tempeh, crumbled into small pieces
• 1/4 cup (28g) sun-dried tomatoes (dry-packed, not oil-packed), roughly chopped
• 1 medium roasted red bell pepper (about 4 oz / 120g), diced — jarred is fine
• 3 cloves garlic, minced
• 1 teaspoon dried oregano
• 1/2 teaspoon dried thyme
• 1/4 teaspoon red pepper flakes (optional)
• 3 cups (720ml) low-sodium vegetable broth
• 1 1/2 cups (360ml) water
• 1/2 teaspoon fine sea salt

For the morning finish:

• 2 cups (60g) baby spinach
• 2 tablespoons (16g) nutritional yeast
• 10 kalamata olives, pitted and sliced (about 35g)
• 1 tablespoon fresh lemon juice
• Freshly ground black pepper to taste

Optional toppings:

• Fresh basil or flat-leaf parsley, torn
• Crumbled feta cheese (adds about 30 calories per tablespoon)
• Extra red pepper flakes

Instructions

Prepare the slow cooker (evening):

1. Rinse the red lentils under cold water until the water runs clear. This removes surface starch that can cause foaming during the long cook.
2. Crumble the tempeh into roughly half-inch pieces with your hands. Smaller crumbles integrate into the porridge for creaminess, while larger pieces maintain more distinct texture — choose based on your preference.
3. Add the steel-cut oats, rinsed lentils, crumbled tempeh, chopped sun-dried tomatoes, diced roasted red pepper, minced garlic, oregano, thyme, red pepper flakes (if using), broth, water, and salt to the slow cooker. Stir everything to combine and distribute the tempeh evenly.
4. Cover and set the slow cooker to LOW. Cook for 7 hours overnight. The recipe is forgiving — anywhere from 6 to 8 hours works, though the texture will be thicker and creamier at the longer end.

Finish the porridge (morning):

5. Remove the lid and give the porridge a thorough stir. The red lentils will have dissolved into the base, creating a naturally creamy consistency. The oats should be tender but still have some pleasant chew.
6. Fold in the baby spinach, nutritional yeast, sliced kalamata olives, and lemon juice. Replace the lid and let sit for 3 to 4 minutes until the spinach wilts completely.
7. Taste and adjust seasoning with salt, pepper, and additional lemon juice as needed. If the porridge is thicker than you prefer, stir in a few tablespoons of hot water or broth until you reach a spoonable consistency.
8. Ladle into bowls and finish with your chosen toppings. Serve warm.

Nutrition per Serving

Estimates based on USDA data for steel-cut oats, red lentils, tempeh, and listed ingredients. Adding optional feta increases calories and protein slightly.

Practical Notes

Meal prep storage. This porridge refrigerates well for up to 4 days in airtight containers. It will thicken as it cools — stir in a splash of broth or water when reheating. Microwave individual portions for 2 to 3 minutes, stirring halfway through. The texture actually improves on day two as the flavors continue to meld.

Slow cooker size. A 4-quart slow cooker is ideal for this batch. If using a 6-quart model, the porridge layer will be thinner and may cook slightly faster — check at the 6-hour mark. A thin coat of cooking spray on the insert prevents sticking along the bottom edges where oats can sometimes catch.

Tempeh alternatives. If tempeh is unavailable, substitute 1 block (14 oz / 400g) of extra-firm tofu, pressed and crumbled. Tofu breaks down more than tempeh during the long cook, yielding a creamier but less textured result. You can also use 1 cup of pre-soaked dried chickpeas — they hold their shape and add roughly equivalent protein, though the porridge will feel more like a stew.

For smaller GLP-1 appetites. If a full serving feels like too much in the morning, serve half portions and pair with a warm cup of herbal tea. The other half stores well for the next day. Even a half serving still delivers about 13 grams of protein — a solid start that you can supplement with a mid-morning snack when appetite returns.

Make it more Greek. For a distinctly Greek twist, swap the sun-dried tomatoes for 2 tablespoons of tomato paste and add half a teaspoon of ground cumin. Top each bowl with a generous spoonful of Greek yogurt instead of feta — this adds another 5 to 6 grams of protein per serving and pairs beautifully with the lemon and oregano.

Frequently Asked Questions

This article provides general food and nutrition guidance only. It does not constitute medical advice. Always consult your healthcare provider regarding your GLP-1 medication and individual nutritional needs.